Cobalt blue

About the chemical structure:

Chemical name:	Cobalt(II) oxide-aluminum oxide
Formula:	CoO · Al2O3
Refractive index:	n/a

Color:

Color Index (C.I.)

PB 28

How can you identify Cobalt blue?

Imaging:

UVF: blue

IRFC: red

OM: cobalt blue has coarse particles, like azurite and ultramarine, but is distinguished microscopically by their non-crystalline appearance. Particle size is usually 1-50μm

Microscopic appearance at x500 mag

Analytics:

It can be identified by FTIR and Raman.

Raman spectra: University College London;

FTIR spectra: IRUG;

Usage and handling:

Permanence:	Toxicity:
Lightfast: excellent Degradation processes: very stable.	non toxic. MSDS: Winsor & Newton

Literature:

Cobaltpigmente (at Pigmentlexikon by Th. Seilnacht)

Cobalt und seine Blaufarben, Neue Zürcher Zeitung, 214, 15.9.1993, p. 67