HP Blue 4463 — Pigment Blue 1 for Specialty Inks & Decorative Coatings | Honor Pigments

Technical Information

What Is PB1

Pigment Blue 1 (CAS 1325-87-7, CI 42595:2) is a triarylmethane PTMA lake pigment, molecular formula C₃₇H₂₈N₂Na₂O₈S₂W, occupying the brightest red-shade blue in the organic pigment spectrum—a position phthalocyanine blues cannot reach. Its triarylmethane carbocation chromophore is precipitated with phosphotungstomolybdic acid, converting the water-soluble cationic dye into an insoluble pigmentary form. This lake architecture gives PB1 its defining combination: exceptionally high tinting strength and a brilliant red-blue mass tone in the spectral gap between green-shade phthalocyanines and violet pigments. Unlike phthalocyanines that fade under UV, PB1 darkens—a distinct degradation pathway formulators must account for. HP BLUE 4463 refines this chemistry into a grade optimized for printing and stationery inks where shade brilliance and tinting strength define the specification.

Why Choose HP BLUE 4463

HP BLUE 4463 exists because phthalocyanine blue cannot produce a clean red-shade blue. PB15:3 and PB15:6 are inherently green-shade; pushing them redder through blending introduces dullness. HP BLUE 4463 delivers the red-blue directly from the triarylmethane chromophore, at higher tinting strength, with no formulation tricks. This makes it the pigment formulators reach for when a corporate brand blue must read warm under retail lighting—exactly where green-shade blues look cold and lifeless.

The HP designation means application-optimized finishing: particle size tuned for lithographic, flexographic, and gravure ink rheology, with dispersion stability that prevents shade drift during long press runs. Among CI 42595:2 grades, HP BLUE 4463 prioritizes print-room performance over raw cost—the red-shade blue that hits the target on the first pass and holds it across the campaign. For stationery ink manufacturers, the high tinting strength means fewer grams per litre—a direct material-cost advantage in high-volume production.

Key Features

• The red-shade blue that phthalocyanines cannot produce. The triarylmethane chromophore absorbs at a longer wavelength than the phthalocyanine Q-band, shifting the reflected hue from green-blue to red-blue. For brand-color printing where the specification says “warm blue” and the alternative is a dull, blended phthalocyanine that reads grey under store lighting, HP BLUE 4463 is the pigment that delivers the shade from chemistry rather than compromise.
• Tinting strength that reduces pigment loading per kilogram of ink. The PTMA lake structure concentrates chromophoric density into each pigment particle, meaning formulators achieve target color strength at lower dosage than phthalocyanine blues. In high-volume publication and packaging ink production, this translates to fewer kilograms of pigment purchased per tonne of finished ink—a procurement advantage independent of the per-kilogram price comparison.
• Controlled particle size for printing ink rheology. HP BLUE 4463’s finishing process targets the particle size window where lithographic ink tack, flexographic flow, and gravure viscosity all stay within press-operating parameters. Over-sized PB1 particles cause plate wear in letterpress and litho; under-sized particles raise viscosity in gravure. HP BLUE 4463 lands in the production window, reducing ink-formulation adjustment time between pigment lots.
• Bright, clean mass tone with minimal undertone contamination. Unlike blended blues that combine a green-shade phthalocyanine with violet to approximate a red-blue—and invariably introduce metamerism—HP BLUE 4463’s mass tone is intrinsically red-blue from a single chromophore. Under D65, A, and TL84 illuminants, the shade reads consistently red-blue rather than shifting violet or green depending on the light source.
• PTMA lake durability calibrated for the application lifecycle. PB1 darkens on prolonged UV exposure rather than fading—a photodegradation behavior that is well-characterized and predictable. For printing inks applied to folding cartons, publication covers, and stationery products with indoor-shelf-life exposure, this durability profile matches the application requirement. HP BLUE 4463 is not specified for outdoor signage or automotive coatings, and that honesty about application boundaries is what makes it a reliable specification for the applications it serves.

Recommended Applications

Primary Applications: Lithographic (sheetfed and web offset), flexographic, and gravure printing inks where a bright red-shade blue is required for brand-color work, process-color enhancement, and spot-color packaging graphics. Stationery inks—fountain pen, ballpoint, stamp-pad, and writing inks—where high tinting strength at low viscosity is the defining requirement. Publication and commercial printing where indoor-lightfastness is the relevant exposure condition and the print product is consumed or cycled within months rather than displayed for years.

Secondary Applications: Textile printing pastes for decorative fabrics with limited outdoor exposure, artists’ colours and educational paints where the unique red-blue shade differentiates product lines, and specialty coating applications where a transparent red-blue tint with high chroma is required and outdoor durability is not specified.

Shade Selection Guide — Blue Pigment Family Map: Need the brightest red-shade blue available, accepting PTMA lake lightfastness → PB1 (HP BLUE 4463, CI 42595:2) | Need a green-shade blue with maximum durability and heat stability → PB15:3 (phthalocyanine β, CI 74160) | Need a red-shade blue with better lightfastness than PB1 but less brilliance → PB60 (Indanthrone, CI 69800) | Need maximum lightfastness in a red-shade blue for outdoor applications → PB15:6 (phthalocyanine ε, CI 74160) with violet shading. PB1 is the anchor for warm-blue printing applications—no other blue pigment can match its combination of red shade and tinting strength, and no phthalocyanine can be treated or blended to fully close the shade gap.

Technical Data

Rating Scale Notes

Lightfastness is assessed by Blue Wool Scale (1–8) under standardized xenon-arc exposure per ISO 105-B02. PB1 exhibits a characteristic darkening rather than fading on prolonged UV exposure—a photodegradation pathway distinct from phthalocyanine fading and one that should be evaluated under the specific lighting conditions of the intended application. Heat stability, migration fastness, and chemical resistance ratings follow standard 1–5 scales per relevant ISO and DIN test protocols. Actual performance depends on pigment concentration, binder system, substrate, and application conditions. Third-party validation under your specific ink formulation, substrate, and end-use exposure is recommended before commercial commitment.

Packaging

Standard packaging: 25 kg multi-wall paper bags with inner polyethylene liner, or 25 kg fibre drums with PE liner. Alternative packaging—including 10 kg sample bags, 500 kg supersacks, and 1000 kg FIBC big bags—is available upon request. All packaging is designed to protect product integrity against moisture ingress and compaction during storage and transit. PTMA lake pigments are hygroscopic; sealed packaging is essential to prevent moisture uptake that affects dispersibility and shade.

Storage

Store in a cool, dry, well-ventilated area away from direct sunlight, moisture, and sources of heat. Recommended storage temperature: 5–35 °C. Keep containers tightly sealed when not in use—the PTMA lake structure is moisture-sensitive, and exposure to humidity can cause particle agglomeration that impairs dispersibility. Avoid stacking beyond manufacturer-recommended pallet height to prevent compaction. Under proper storage conditions, the product maintains its specified properties throughout the stated shelf life.

Shelf Life

Minimum 24 months from date of manufacture when stored in unopened original packaging under recommended conditions. Beyond this period, re-testing of key quality parameters—including shade, tinting strength, and dispersibility—is advised before use. PTMA lake pigments are susceptible to moisture-induced degradation; prolonged exposure to high humidity or temperature cycling may accelerate changes in coloristic properties and dispersibility even within the nominal shelf-life window.

Transportation

This product is not classified as dangerous goods under UN, IMDG, IATA, or ADR/RID transport regulations. No special handling or hazard labelling is required during transport. As with all fine organic powders, protect from moisture and physical damage during transit, and follow standard dust-control practices during unloading. PTMA lake pigments contain tungsten and molybdenum in the complex acid counterion; consult the latest SDS for specific disposal and environmental release guidance in your jurisdiction.

Frequently Asked Questions About PB1

Pigment Blue 1 vs PB15:3 — which blue pigment for red-shade printing inks

PB15:3 (phthalocyanine β, CI 74160) is inherently green-shade—no surface treatment can shift it far enough into red-blue territory without introducing dullness. PB1 (CAS 1325-87-7, CI 42595:2) produces a red-shade blue directly from its triarylmethane chromophore, at higher tinting strength than any phthalocyanine. For a packaging brand colour specifying “warm blue” or “royal blue,” formulators have two choices: blend PB15:3 with violet and accept metamerism risk, or use PB1 as a single pigment with no illuminant-dependent colour shift. HP BLUE 4463 delivers this red-blue at lower pigment loading than a PB15:3-plus-violet blend, with batch-to-batch consistency that blended alternatives cannot match because two-component systems drift independently across production lots.

Lightfastness expectations for PTMA lake pigments in indoor printing applications

PB1 (CAS 1325-87-7, CI 42595:2) does not fade—it darkens. This triarylmethane photodegradation pathway is fundamentally different from the bond-cleavage fading of azo pigments or slow bleaching of phthalocyanines. For indoor printing—publication covers, folding cartons, stationery, and general commercial print with months-to-years of indoor exposure—the darkening develops slowly enough that the printed product remains commercially acceptable throughout its intended lifecycle. The boundary is direct sunlight: a poster in a south-facing window shows visible darkening within weeks, which is why PB1 is not specified for outdoor signage. HP BLUE 4463’s finishing consistency means the darkening rate is predictable lot to lot, letting formulators set realistic shelf-life expectations with brand owners at specification rather than fielding complaints after retail delivery.

Best blue pigment for high-tinting-strength stationery and writing inks

Stationery inks—fountain pen, ballpoint, stamp-pad, and drawing inks—demand high tinting strength at low pigment loading because excess solids raise viscosity and clog fine writing tips. PB1 (CAS 1325-87-7, CI 42595:2) delivers the highest tinting strength per gram of any organic blue pigment, a consequence of the triarylmethane chromophore’s molar absorptivity amplified by the PTMA lake structure. Formulators achieve target colour intensity with fewer grams per litre, keeping viscosity low and material cost under control. HP BLUE 4463’s controlled particle size ensures smooth dispersion in low-viscosity writing ink vehicles, preventing the sedimentation and tip-clogging that generic PB1 grades cause when particle size tails into the coarse fraction. For stationery manufacturers, HP BLUE 4463 under CI 42595:2 is the grade combining shade brilliance, tinting economy, and formulation reliability in a single specification.

Pigment Blue 1 CI 42595 heat stability for packaging ink lamination

PB1 (CAS 1325-87-7, CI 42595:2) has a practical heat stability ceiling of approximately 150–180 °C—determined by the thermal stability of the PTMA complex acid counterion rather than the triarylmethane chromophore. This covers heat-seal and lamination temperatures typical of flexible packaging (120–160 °C), but not retort sterilization (121 °C sustained) where prolonged exposure may trigger shade shift. For standard heat-seal lamination of snack-food and confectionery packaging printed with lithographic or flexographic inks, HP BLUE 4463’s thermal behaviour is adequate and predictable—the pigment survives the brief heat pulse of the lamination nip without noticeable change. For retort, boil-in-bag, or microwaveable packaging, PB1 is not the recommended pigment; PB15:3 or PB60 should be evaluated. HP BLUE 4463 is transparent about this thermal boundary, letting packaging printers specify it confidently for the applications where it works.

Pigment Blue 1 PTMA lake vs Indanthrone Blue PB60 — shade and durability trade-off

PB60 (Indanthrone Blue, CI 69800) is the alternative red-shade blue with better lightfastness than PB1—but at a shade and strength cost. Indanthrone is inherently duller, with a muted red-blue lacking the brilliance of the triarylmethane chromophore in PB1 (CAS 1325-87-7, CI 42595:2). Its tinting strength is lower, requiring higher pigment loading to reach equivalent visual depth. The trade-off: PB60 for outdoor durability at the expense of shade brilliance; PB1 for maximum shade impact and tinting economy in indoor applications. For a publication cover or folding carton that will spend its lifecycle indoors and be replaced seasonally, PB1 is the technically superior choice—the shade is brighter, the ink costs less per thousand impressions, and the darkening pathway is irrelevant over the product’s exposure window. HP BLUE 4463 maximizes this indoor-focused value proposition with dispersion consistency that keeps the bright red-blue reading identically from first impression to last.

Disclaimer

The information provided herein is based on our current knowledge and experience and is accurate to the best of our understanding. It does not constitute a legally binding warranty of specific product properties or suitability for a particular application. Users are responsible for conducting their own tests to determine the suitability of the product for their specific purposes and for compliance with applicable laws and regulations—particularly with respect to the PTMA lake pigment’s characteristic lightfastness behaviour (darkening on UV exposure) and moisture sensitivity. Nothing herein shall be construed as a recommendation to use any product in conflict with any third-party intellectual property rights.