Cobalt Zinc Silicate Blue

PB74

Alternate Name

Cobalt Blue Deep

Pigment Description

The classic Cobalt Blue Deep. Lower in lightness than most PB28 varieties this cobalt has a leaning toward indigo/violet. It has a note of semi-opacity where ultramarine is transparent.

Sources give this excellent lightfastness ratings. However there may be some sensitivity to certain testing methods.

Handle with care and take precautions due to Cobalt, Zinc and Boron. The Artist's Guide to Health and Safety for information about the hazards associated with cobalt, zinc, and boron pigments (all three). The most currently updated information can be requested from the author's site.

Resources

PB74 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com

Information about PB74 from Bruce MacEvoy, Handprint Guide to Watercolors,

Stats

Lightfastness

Excellent

This particular pigment was not mentioned in Golden’s recent testing with mixing whites (they mention Cobalt Blue Deep but it may be PB28). It may be useful to compare with other cobalts such as PB28.

Transparency

Semi-Opaque

Oil paints may range from transparent to opaque depending on the formulation. Most however are Semi-Opaque

Toxicity

Hazard, Use more caution.

Artiscreation says, "Hazard if carelessly handled, ingested in large amounts or over long periods of time; Do not ingest; Avoid dust & spray." The Artist's Guide to Health and Safety for information about the hazards associated with cobalt, zinc, and boron pigments (all three). The most currently updated information can be requested from the author's site. Treat all pigments and paints with studio safety protocols.

Tinting

Moderate to Low

Depends on pigment load

Dry Time

Many paintmakers list 2 days or less

Chemical Name

Cobalt Zinc Silicate Blue Phenacite

(Co,Zn)₂SiO₄

Dry Pigments listing PB74

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