Section
| HS Code | 438382 |
| Productname | Victoria Pure Blue BO |
| Synonyms | Basic Blue 7; C.I. 42595; Victoria Blue BO |
| Colorindexname | Basic Blue 7 |
| Colorindexnumber | 42595 |
| Casnumber | 2390-60-5 |
| Einecsnumber | 219-232-8 |
| Molecularformula | C33H40ClN3 |
| Molecularweight | 514.14 g/mol |
| Dyeclass | Triarylmethane dye |
| Appearance | Dark blue powder |
| Color | Blue |
| Solubility | Soluble in water |
| Principaluse | Textile dyeing, paper dyeing, and biological staining |
As an accredited Victoria Pure Blue BO factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Victoria Pure Blue BO is supplied as 100 g in a sealed amber glass bottle with tamper-evident cap and hazard label. |
| Container Loading (20′ FCL) | 20-foot FCL container loaded with Victoria Pure Blue BO in securely palletized drums, properly labeled and stowed for ocean transport. |
| Shipping | Ship Victoria Pure Blue BO in well-sealed, labeled containers at ambient temperature, protected from moisture, light, and oxidizers. Avoid dust generation and environmental release. Follow the current SDS and carrier regulations; classify as non-regulated only if the SDS confirms it. |
| Storage | Store Victoria Pure Blue BO in a cool, dry, well-ventilated area in a tightly closed, labeled container. Keep away from strong oxidizing agents, acids, and sources of ignition; protect from moisture and direct sunlight. Prevent dust generation and store separately from food, feed, and incompatible chemicals. Use appropriate personal protective equipment when handling. Ensure secondary containment and clear labeling. |
| Shelf Life | Under recommended cool, dry, dark storage in a tightly closed container, Victoria Pure Blue BO remains stable for approximately five years. |
In low-viscosity stamp pad, fibre-tip marker, and ballpoint pen ink concentrates, Victoria Pure Blue BO is handled as C.I. Basic Blue 7, Colour Index constitution number 42595, CAS 2390-60-5. The cationic triarylmethane dye is dissolved under prop-shaft agitation at 60 °C to 70 °C in a solvent base containing benzyl alcohol and diethylene glycol monophenyl ether before addition of an acid-modified ketone resin. Final dye loading in stamp pad ink is held between 4.0 wt% and 9.0 wt% on total ink mass. In ballpoint formulations the working range is narrower, between 1.2 wt% and 3.5 wt% on total ink mass, because higher concentrations produce dye aggregation at the brass ball seat and feed-channel blockage after 72 h capillary ageing at 40 °C. Precipitation control is verified by maintaining a vehicle acid value above 40 mg KOH/g and by filtering the dissolved dye through a 5 µm polypropylene bag before addition of thixotropic silica. Lightfastness of the dried ink film is screened according to ASTM D4303-10 against Blue Wool 5. Element migration in inks sold into toy craft applications is assessed in accordance with EN 71-3:2019. Terminal products are stamp pads, fibre-tip marker reservoirs, skeleton-type ballpoint refills, and typewriter ribbon re-inking formulations.
Wet-end addition to bleached kraft and recycled tissue stock is controlled by the point of injection relative to alum and cationic starch. The dye is metered at 0.01 wt% to 0.08 wt% on oven-dry fibre from a day tank with continuous recirculation through a 150 µm in-line filter. Injection before alum at stock pH 5.0 to 5.5 produces fibre wall adsorption and uniform pastel blue. Injection after cationic starch at the fan pump creates visible blue motes because the dye cation is no longer available for controlled ionic exchange with the fibre surface. On a fourdrinier producing tissue in the 50–80 g/m² basis weight range, first-pass retention is maintained by adding 250–400 ppm of low-viscosity poly-DADMAC immediately after dye injection. Lightfastness of the tinted sheet is tested under ISO 105-B02; C.I. Basic Blue 7 exhibits limited xenon arc fastness and is therefore not specified for exterior graphic paper or laminated presentation board without an ultraviolet-blocking overprint. Migration screening for stationery and craft paper follows EN 71-3:2019. Food-contact clearance is not assumed, and the dye is not specified for direct food-contact paper or board. Terminal products include coloured tissue, napkin stock, envelope interiors, and non-food packaging where shade control from deckle to reel is the production-critical parameter.
Victoria Pure Blue BO is applied to chrome-tanned crust or shaved leather in the wet-end dyeing drum after neutralization to a float pH between 5.0 and 5.5. The dye is pre-dissolved in hot water at 60–70 °C and poured through a 100 µm stainless steel strainer into the rotating drum over 15 min. Dosage is set on shaved weight at 0.5% to 2.0% depending on target penetration and surface intensity. After dye exhaustion, a fatliquor is added at 4% to 8% on shaved weight to restore fibre separation. The float is then fixed with formic acid to a final pH of 3.6 to 3.8. Penetration is assessed on thick hides by cutting the butt section and inspecting subsurface colour. Chromium VI development in the dyed leather is evaluated by ISO 17075-1 with a reporting limit of 3 mg/kg. Restricted chemical management for leather follows the ZDHC Manufacturing Restricted Substances List, and the dye is acceptable only when the final article passes the specified migration and extractable metal limits. Terminal articles include shoe upper leather, upholstery leather, and bookbinding leather where the blue shade is built in the wet-end rather than by a surface pigment finish.
Extrusion-grade masterbatch evaluation in polymethyl methacrylate and styrene-acrylonitrile copolymers requires hopper drying of both resin and dye at 80 °C for 4 h to keep residual moisture below 0.1%. Victoria Pure Blue BO is dry-blended at 0.02 wt% to 0.06 wt% active dye in the final moulded article, then compounded on a co-rotating twin-screw extruder with L/D 44:1 and barrel temperature profile 180–210 °C. The processing window is narrow. Melt residence above 240 °C for more than 90 s causes irreversible thermal fading of the triarylmethane cation, so hot-runner injection moulding is limited to nozzle temperatures not exceeding 230 °C. Melt mass-flow rate is checked according to ISO 1133-1:2022 at 220 °C with 10 kg load. Tensile properties of injection-moulded chips are checked according to ISO 527-2. Haze of transparent plates is measured according to ISO 14782 at 2 mm wall thickness. No food-contact plastic clearance is claimed. Terminal products are transparent blue cosmetic caps, appliance lenses, and display components where clarity and depth of shade are specified together. Published comparative data for this specific dye in SAN at different haze levels is limited; formulators should generate internal data on the actual injection tool.
| Application | Standard or regulatory check | Endpoint | Boundary condition |
|---|---|---|---|
| Ink film lightfastness | ASTM D4303-10 | Accelerated light exposure | Blue Wool 5 reference |
| Ink and stationery element migration | EN 71-3:2019 | Migration of elements from dry film | Category 3 materials |
| Dyed paper lightfastness | ISO 105-B02 | Xenon arc fading | Blue Wool ladder |
| Dyed leather chromium VI | ISO 17075-1 | Cr(VI) content in leather | Reporting limit 3 mg/kg |
| Plastics melt mass-flow rate | ISO 1133-1:2022 | MFR after dye incorporation | 220 °C, 10 kg |
| Plastics tensile properties | ISO 527-2 | Tensile strength and elongation | Injection-moulded chips |
| Plastics haze | ISO 14782 | Transparent plate haze | 2 mm wall thickness |
| Wood coating element migration | EN 71-3:2019 | Migration of elements from dried lacquer | Category 3 limits |
| Wood coating artificial weathering | ISO 11341 | Filtered xenon arc exposure | Exterior screening only |
| Acrylic fibre washing fastness | ISO 105-C06 | Domestic and commercial laundering | Dyed fibre fastness |
Acrylic and nitrocellulose wood stain concentrates are built by dissolving the dye at 30–50 g/L in a blend of isopropanol, ethyl acetate, and 2-butoxyethanol under sealed-head mechanical stirring at 20–30 °C. The resulting concentrate is strained through a 25 µm wire mesh before blending into a clear lacquer base at a final dye loading of 0.05 wt% to 0.3 wt% on total lacquer solids. Acid-catalysed lacquer systems are not used because the triarylmethane salt can decompose in the presence of strong mineral acid. The stain is applied by spray or pad coating to closed-grain veneer, then sealed with a UV-absorbing topcoat because the dye has limited lightfastness on wood under direct sunlight. Element migration from dried lacquer films on toys is checked against EN 71-3:2019 Category 3 limits. Solvent emission from the final coating is assessed under manufacturing site permits rather than by a single dye supplier specification. Terminal products are transparent blue wood stains for furniture, interior trim, and decorative veneer where deep blue grain highlighting is the required effect. Published data for exterior performance of this specific dye in wood lacquer is limited; exterior end use is not specified without accelerated weathering to ISO 11341.
Victoria Pure Blue BO is applied to acrylic tow and staple in pressurised beam or package dyeing machines at 0.1% to 2.0% on weight of fibre. The dyebath is set at pH 4.5 to 5.0 with acetic acid/sodium acetate buffer, and the temperature is raised from 70 °C to 98–102 °C at 1 °C/min, holding for 45–60 min. A cationic retarder is dosed at 0.15–0.30% on weight of fibre before dye addition to control strike and reduce skitteriness on high-orientation tow. Exhaustion is monitored by sampling the bath; incomplete exhaustion after the hold period is corrected by adding 0.5 g/L of anhydrous sodium acetate and holding for a further 20 min. Fastness of the dyed fibre is tested to ISO 105-B02 for lightfastness and to ISO 105-C06 for washing fastness; both are specified because basic dyes on acrylic can retain good wash fastness but limited lightfastness. Restricted substance screening for heavy metals follows the downstream brand restricted substance list; the dyed fibre is not specified for infants’ wear unless migration data are available. Terminal products are acrylic sweaters, upholstery pile, craft yarns, and technical felts where bright blue shades require controlled cationic dye exhaustion. Published kinetic data for this specific dye on acrylic fibre is limited, so the heating rate is adjusted from pilot-beam penetration tests on each fibre supplier variation.
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Victoria Pure Blue BO is the trade designation applied to the aminotriarylmethane dye C.I. Basic Blue 7, C.I. Constitution 42595, CAS Registry Number 2390-60-5. The chromophore is isolated as a chloride salt and supplied as a dark green to dark bronze crystalline powder; dilution in demineralised water yields a blue solution with a spectrophotometric maximum in the 610–618 nm region. The product is controlled as a colour-indexed dye rather than as a single analytical standard, which means that batch release depends on spectrophotometric strength, shade, insolubles, and moisture content against a certified reference. On production-scale dyeing lines, the most frequent source of batch-to-batch variation is not the chromophore identity but residual salt content and crystal size distribution, both of which influence dissolution rate in continuous metering systems.
The commercial specification is conventionally expressed through spectrophotometric strength, insoluble matter, shade match, and moisture content. These criteria are not fixed statutory limits; they represent typical release controls found in commercial certificates of analysis for C.I. Basic Blue 7 powder. The exact solubility in water is commonly stated qualitatively as soluble, and published quantitative solubility data for this specific configuration is limited. For final-product qualification, the dye should be evaluated under the application conditions because salt content and pH can shift the visible absorbance spectrum.
| Parameter | Representative criterion | Measurement basis |
|---|---|---|
| C.I. generic name | Basic Blue 7 | Colour Index International |
| C.I. Constitution | 42595 | Colour Index International |
| CAS Registry Number | 2390-60-5 | CAS registry |
| Absorbance maximum in demineralised water | 610–618 nm | UV-Vis diluted solution |
| Dye strength vs reference | 100±3 % | Spectrophotometric assay |
| Insolubles retained on 45 µm screen | ≤0.5 % | Aqueous filtration |
| Moisture by oven drying at 105 °C | ≤5.0 % | Gravimetric |
Visible absorbance measurement is performed on a double-beam spectrophotometer with a 1 cm path length; the solution is filtered through a 0.45 µm PTFE membrane before reading. If the feedstock contains residual sodium chloride or sodium sulphate, the apparent absorptivity per gram is lower; therefore strength is expressed relative to a reference lot of known C.I. Basic Blue 7 content. The exact mass required for a target absorbance is calculated from the reference absorptivity, and published data for this specific configuration is limited.
Addition of Victoria Pure Blue BO to bleached sulphite or groundwood stock is carried out in the size press or in the beater at 0.005–0.05 wt% on bone-dry fibre, depending on target shade. Retention on cellulose is governed by the charge density of the furnish; alum at 0.5–1.5 wt% in combination with rosin size at 1.0–3.0 wt% promotes precipitation of the cationic dye onto anionic sites. On high-speed paper machines with hydraulic headboxes, the dye solution should be metered after final screening to avoid shear-induced coagulation with anionic retention aids. Process operators have observed that adding the dye ahead of pressure screens can increase deposit formation on the forming fabric; therefore injection after final screening and before the fan pump is preferred. The addition rate should be adjusted by continuous shade monitoring with an inline spectrophotometer calibrated to the CIE L*a*b* target, not by visual inspection alone.
Victoria Pure Blue BO shares the operational boundary of all basic triarylmethane dyes: high tinctorial strength and comparatively low lightfastness. On bleached kraft paper, accelerated exposure can reveal fading comparable to ISO 105-B02 rating 3 or lower; however, the absolute rating is furnish-dependent and must be measured on the finished sheet rather than assumed from dye class. Where an application requires an ISO 105-B02 rating above 4, substitution with an anthraquinone basic blue or a selected azo acid dye is typically required after charge-compatibility screening. The product is unsuitable for outdoor signage inks or automotive interior textiles without ultraviolet stabiliser packages, and even with stabilisers the triarylmethane chromophore remains less photostable than phthalocyanine blue.
In solution preparation, the alkaline shift above pH 10 converts the cationic dye to the carbinol base with loss of colour; metering into a paper machine wet end should maintain a stock pH of 4.0–5.5 to avoid precipitation. Hard water containing calcium above 200 mg/L can reduce solubility and produce a bronze surface deposit, so chelating agents such as ethylenediaminetetraacetic acid at 0.1–0.3 g/L are introduced before the dye solution is injected. The dye bath should not be combined with anionic retention aids or anionic wetting agents in a single addition point; co-addition can produce a coagulated complex that blocks filter screens and causes streaks on the paper web.
For leather staining, the product is dissolved at 0.1–0.5 g/L in water at 50–60 °C and applied to crust or retanned leather by drum or brush. Penetration is better at pH 3.5–4.0, where the leather surface charge condition supports fibre opening; subsequent fixation with formic acid at 0.3–0.5 % on wet weight reduces migration into the finish. Rub fastness of the stained leather should be assessed according to ISO 105-A02 under both dry and wet conditions, and the result will depend on the retanning agent and fatliquor load. In printing ink formulations, the dye is predissolved in demineralised water or a glycol-ether mixture before addition to the letdown vehicle; insoluble matter must be below 0.5 % to prevent plate or anilox cell blockage.
Victoria Pure Blue BO differs from Victoria Blue B, C.I. Basic Blue 26, C.I. Constitution 44045, primarily in the substitution pattern of the naphthyl ring. The ethylamino substitution in Basic Blue 7 shifts the visible maximum to a shorter wavelength than many Basic Blue 26 formulations and gives a visually greener, more intense blue in dilute aqueous solution. Both products are cationic triarylmethane dyes and therefore share poor lightfastness and sensitivity to alkaline precipitation, but they are not directly interchangeable in colour matching without recalibration of spectrophotometric shade standards. The relative hue should be established by reflectance curves on the target substrate rather than inferred from dye class alone.
| Parameter | Victoria Pure Blue BO | Victoria Blue B |
|---|---|---|
| C.I. generic name | Basic Blue 7 | Basic Blue 26 |
| C.I. Constitution | 42595 | 44045 |
| CAS Registry Number | 2390-60-5 | 2580-56-5 |
| Substitution feature | Ethylamino naphthyl group | Dimethylamino substitution pattern |
| Fastness class | Low lightfastness, similar | Low lightfastness, similar |
| Typical use emphasis | Paper, ink, leather stain, biological staining | Paper, leather, biological staining |
Dry Victoria Pure Blue BO should be stored in sealed polyethylene-lined fibre drums below 40 °C and relative humidity below 60 % to reduce caking. Dust control at the weigh station is managed through local exhaust ventilation or a downflow booth; the powder can stain skin and equipment and should be predissolved in a closed mixing vessel. Under REACH, C.I. Basic Blue 7 is managed according to the tonnage band and uses declared by the registrant, and downstream users are obliged to verify the current registration status with the supplier. If the dye is intended for packaging inks applied to toys or food-contact materials, the finished printed article must be tested against EN 71-3 migration limits or the relevant national food-contact measure; Victoria Pure Blue BO is an intermediate colorant and cannot be certified as a finished printed article.
