Bismuth Subnitrate

✦ High-opacity white pigment delivering full, even coverage in face powders and foundations
✦ Scatters and diffuses surface light to create a soft-focus blurring effect on skin
✦ Exceptionally silky particle texture improves skin feel and spreadability in powder formulations
✦ Inorganic, inert compound — stable across a wide range of cosmetic formulation conditions
✦ Compatible with titanium dioxide, zinc oxide, mica, and iron oxide pigments for custom opacity and shade control
✦ Applicable in face makeup, nail products, tinted BB creams, and topical pharmaceutical preparations
✦ Odorless and pure white — provides a clean base for tinted, full-coverage, and complexion cosmetics

Bismuth Subnitrate is a white inorganic crystalline powder derived from bismuth, a naturally occurring heavy metal element found in the earth's crust. Chemically classified as a basic bismuth nitrate, it has been used in medical and pharmaceutical preparations for centuries and was later adopted by the cosmetics industry as a white colorant and opacifier. Its high density, fine particle structure, and clean white appearance made it a natural selection for early pressed powders and decorative makeup formulations.

What distinguishes Bismuth Subnitrate from other white pigments is its exceptionally smooth and silky particle texture, which gives powder-based cosmetics a luxurious, cushioned feel on application. Its high specific gravity allows for solid opacity without the chalky drag sometimes associated with alternatives such as calcium carbonate. The ingredient also exhibits a strong light-scattering effect linked to its elevated refractive index, helping finished formulations blur fine lines, reduce shine, and create an airbrushed visual effect on the skin surface.

Rabibazaar supplies cosmetic-grade Bismuth Subnitrate suitable for DIY makeup formulators, professional cosmetic manufacturers, and nail product creators in Pakistan.

INCI Name : Bismuth Subnitrate (CI 77713)
Chemical Name : Basic Bismuth Nitrate / Bismuth Oxynitrate
CAS Number : 1304-85-4
Molecular Formula : BiNO4 (simplified); Bi5O(OH)9(NO3)4 (complex hydrolysis form)
Appearance : Fine white crystalline powder
Odor : Odorless
pH (1% solution) : 3.5 – 5.0 (aqueous suspension)
Solubility : Practically insoluble in water and alcohol; soluble in dilute mineral acids
Specific Gravity : 4.90 – 5.00
Flash Point : Not Applicable (non-flammable inorganic solid)
HLB Value : Not Applicable
Recommended Use Level : 0.5% – 25% depending on application and desired opacity
Type : Inorganic pigment / Opacifier / Colorant
Shelf Life : 3 years when stored in a sealed container away from moisture

Face Makeup (Foundations, Loose and Pressed Powders) ★★★★★
Bismuth Subnitrate is most effective in this category, providing full opacity and a smooth, silky skin feel. Use at 10–25% in pressed powders and 3–8% in liquid foundations for coverage without cakiness.

Skincare (Tinted Moisturizers, BB Creams, Serums) ★★★☆☆
Useful at low levels in tinted skincare for light-to-medium coverage with a blurring effect. Limit to 3–5% in leave-on formulations and pair with emollients to prevent dry or powdery texture.

Nail Products (Nail Polish, Base Coats, Nail Lacquers) ★★★★★
Provides exceptional white opacity and a smooth finish in nail polishes and opaque base coats. Use at 8–15% and disperse thoroughly in solvent before incorporating into the nail formula.

Soap Making (Cold Process, Melt and Pour) ★★☆☆☆
Bismuth Subnitrate is not well suited to cold process soap due to the high alkaline pH causing potential discoloration. Restrict use to Melt and Pour systems at 0.5–2% for white colorant effect.

Functional Cosmetics (Deodorants, Sunscreen, Baby Care) ★★☆☆☆
Limited role in this category; bismuth compounds should be avoided in baby care and are not recommended in sunscreen as a primary UV filter. Use with caution and at minimal levels only.

When I formulate with Bismuth Subnitrate in pressed powder products, I always treat it as a texture agent as much as a pigment. Its silky particle surface does the heavy lifting for skin feel, which means I can reduce talc or sericite mica loading and still achieve a luxurious finish. I never dry-blend it directly into the bulk without pre-milling — coarse dispersion produces uneven coverage and a gritty sensation that customers notice immediately. In nail formulas, I disperse it in butyl acetate before incorporating into the lacquer base to ensure full suspension and prevent settling in the bottle.

ADVANCED TIP: To maximize the soft-focus blurring effect in a pressed powder, blend Bismuth Subnitrate at 15% with spherical silica at 3% and boron nitride at 2%. This combination creates a multi-dimensional light-scattering matrix that outperforms titanium dioxide alone in reducing the appearance of pores and fine lines under natural and artificial lighting conditions.

Normal Skin : ★★★★★ — Delivers smooth, even coverage without disrupting the skin barrier or altering sebum balance.
Dry Skin : ★★★☆☆ — Can feel drying in high-concentration powder formulations; pair with emollient powders such as tapioca starch or magnesium myristate to offset texture.
Oily Skin : ★★★★☆ — Absorbs surface shine and provides a matte finish that performs well on oily skin types throughout the day.
Combination : ★★★★☆ — Works effectively in powder-based products targeting oil control in the T-zone while maintaining coverage elsewhere.
Sensitive Skin : ★★★☆☆ — Generally considered inert but bismuth compounds can occasionally cause mild contact irritation; patch test is always advised.
Mature Skin : ★★★☆☆ — May emphasize fine lines in high-loading powder formulas; use at moderate levels and combine with line-filling spherical fillers for best results.
Acne-Prone : ★★★☆☆ — Non-comedogenic at typical cosmetic use levels, but avoid heavy powder coverage that can trap sebum and worsen congestion.

CONCEPT 1: Silky Full-Coverage Setting Powder
Usage Level : 15%
Key Ingredients: Talc, Titanium Dioxide, Mica, Zinc Stearate
Result : A smooth, high-opacity setting powder that controls shine, blurs skin texture, and delivers a natural satin finish suitable for all skin tones when blended with appropriate iron oxides.

CONCEPT 2: Opaque White Nail Polish Base
Usage Level : 12%
Key Ingredients: Nitrocellulose, Butyl Acetate, Ethyl Acetate, Tosylamide/Formaldehyde Resin
Result : A smooth, fully opaque white nail lacquer with excellent coverage, clean white pigmentation, and a glossy finish that requires minimal coats.

CONCEPT 3: Tinted Coverage BB Cream
Usage Level : 4%
Key Ingredients: Emulsifying Wax NF, Titanium Dioxide, Niacinamide, Sodium Hyaluronate
Result : A lightweight, skin-evening BB cream that provides natural medium coverage with a soft-focus blurring effect while delivering hydration and brightening through active co-ingredients.

INCI Declared : Yes — must be declared on all cosmetic product labels as Bismuth Subnitrate (CI 77713)
EU Cosmetics Reg : Permitted with restrictions — listed in Annex IV as colorant CI 77713; not permitted in applications intended for use near mucous membranes
Rinse-Off Limit : No specific limit established — use at effective level
Leave-On Limit : No specific limit established — use at effective level within safety assessment guidance
Allergen Alert : No — not classified as a known fragrance or skin allergen under EU Cosmetics Regulation
Skin Safety : Safe at recommended levels; patch test advised for sensitive skin individuals
Eye Area Use : Use with caution — avoid use in loose powder formats near the eyes due to inhalation and particle exposure risk
Ingestion : Not for internal use
Pregnancy Use : Consult physician — bismuth compounds warrant caution during pregnancy; topical leave-on use should be evaluated by a healthcare provider
Child Safety : Avoid in products intended for children under 3 years of age
Ventilation : Recommended — avoid inhalation of fine powder during weighing, blending, and manufacturing
Storage : Cool dry place; protect from moisture and heat; keep container tightly sealed
Container : HDPE or glass — avoid reactive metal containers

⚠️ Warning: Bismuth Subnitrate is a heavy metal-based inorganic compound. Prolonged inhalation of fine particles poses a health risk during manufacturing — always handle with a fitted dust mask and ensure adequate ventilation. Bismuth accumulation in the body may occur with excessive or prolonged exposure. Avoid use in alkaline formulations above pH 9 as discoloration may result. Not suitable for use in products designed for mucous membrane contact.

Working pH Range : 3.5 – 7.0
Heat Stability : Stable up to 400°C; no degradation at standard cosmetic processing temperatures
Freeze-Thaw Stable : Yes
Emulsion Type : Not applicable (solid inorganic pigment)
Emulsification Phase: Either — pre-disperse in oil or water phase before bulk incorporation
Compatible With : Titanium dioxide, zinc oxide, mica, talc, iron oxides, boron nitride, zinc stearate
Incompatible With : Strong mineral acids (causes dissolution), strong alkalis above pH 9 (causes discoloration), reducing agents
Oxidation Risk : Low — inorganic compound; no antioxidant required
Discoloration Risk : Possible — may turn yellow to brown in strongly alkaline environments such as cold process soap systems
Formulation Notes : Always pre-disperse Bismuth Subnitrate in a small amount of silicone fluid or light oil before incorporating into emulsions or pressed powder bulks to prevent agglomeration. In nail formulations, disperse in solvent under high shear before addition to the lacquer base to ensure uniform suspension.

Q: What does Bismuth Subnitrate do in a cosmetic formula?
A: Bismuth Subnitrate functions as a white colorant and opacifier that provides high coverage and a silky, smooth texture in face powders, foundations, and nail polishes. Its high refractive index also creates a light-scattering effect that softens the appearance of pores and fine lines.

Q: Is Bismuth Subnitrate safe to apply to the skin?
A: Yes, Bismuth Subnitrate is permitted under EU Cosmetics Regulation as colorant CI 77713 and is considered safe at recommended cosmetic use levels. Patch testing is advised for sensitive skin, and powder handling during manufacturing must be done with proper dust protection to avoid inhalation.

Q: At what concentration should I use Bismuth Subnitrate in a pressed powder?
A: Typical usage in pressed and loose face powders is 10–25% depending on the coverage target. Begin at 10% and increase incrementally while evaluating opacity, skin feel, and the texture balance with other powder components.

Q: Can Bismuth Subnitrate be used in cold process soap?
A: It is not recommended for cold process soap because the high alkaline environment during saponification can cause the pigment to discolor, shifting from white to yellow or off-white. Melt and Pour soap is the appropriate method, using Bismuth Subnitrate at 0.5–2% for a white colorant effect.

Q: How does Bismuth Subnitrate compare to Titanium Dioxide as a white pigment in cosmetics?
A: Titanium Dioxide delivers a brighter, more reflective white with a higher tinting strength and is the preferred choice when maximum whiteness or UV protection is needed. Bismuth Subnitrate offers a softer, silkier finish with superior skin feel, making it the better option when texture and a natural blurring coverage effect are the formulation priority.

Product evaluation

Review the specifications, supplied grade, intended use and compatibility of Bismuth Subnitrate before ordering for production. Test a small quantity in the actual application and document the result before scaling.

Quality control

Inspect the received batch for expected appearance, odor, texture, packaging condition and labeling. Keep supplier and batch records, use accurate measurements, and retain a reference sample when the material is used commercially.

Storage and responsible use

Store tightly closed in a clean, cool and dry location away from direct sunlight. Follow the current supplier instructions and all safety, labeling and regulatory requirements that apply to the intended finished product.