French Chalk
Talc, which may include natural mica. A warning if using dry pigments that talc may contain asbestos: Monona Rossol has done work to raise awareness on this hazard, so please consult her research even if you are using something labeled 'asbestos free' talc-- it may not actually be 'asbestos free' even though it’s labeled that way. It is worth looking into what she has found. Resources can be found at her site. Also please not that this may have silica which would be harmful to breathe. This ingredient is also not often listed on paint tubes, however it is an extender.
PW26 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com
Rossol, Monona. The Artist's Complete Health and Safety Guide. New York, NY : Allworth Press, 2001. The book is rather dated, updated information is available from her website.
Transparent, Opaque in Water
Hazard, Talc
NPIMI advises to contact the supplier for the potential hazard of fiberous content as well as quartz. Monona Rossol has done extensive research on the regulatory environment and the hazards around Talc. Please reach out to her for more robust information. Treat all pigments and paints with studio safety protocols.
Very Fine
hydrated magnesium silicate
Mg₃Si₄O₁₀(OH)₂
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