PB28

Cobalt Blue

Cobalt is an extremely stable inorganic pigment. Historically, it has been used in jewelry and ceramics.

1. Code: PB28
2. Chemical names: cobalt(II) oxide-aluminium oxide, or cobalt(II) aluminate
3. Formula: CoAl2O4
4. Permanence: very lightfast, I (ASTM), BWS 8;8;8

PB35

Cerulean Blue

1. Code: PB35
2. Chemical names: cobalt stannate, cobalt tin oxide
3. Formula: Co2SnO4
4. Permanence: very lightfast, I, BWS 8;8;8

PB36

Cobalt Turquoise, Cobalt Chromite

1. Code: PB36
2. Chemical names: aluminum chromium cobalt bluegreen
3. Formula: Co(Al,Cr)2O4
4. Permanence: very lightfast, I (ASTM), BWS 8;8;8