A deep blue that can break to pinks and violets under certain conditions.
Cobalt Carbonate shares many of the inhalation hazards of Cobalt Oxide, and as with many mineral colourants, can irritate the skin on contact, particularly sensitive areas like the eyes or nasal membranes.As with its Oxide counterpart, it has been given a 2B carcinogen rating, which indicates possible carcinogenic properties in humans.
There is some evidence to suggest inhalation of the dust and fumes may cause diffuse intestinal lung-fibrosis, and extended exposure has resulted in a high occurrence of bronchitis and indications of emphysema.In addition, inhalation can cause cardiomyopathy, dyspnea, polycythemia, metabolic acidosis, wheezing, asthma, conjunctivitis, rhinitis and goitre.
Cobalt, if ingested, can cause abdominal pain, diarrhoea, nausea, vomiting and polycythemia.
Cobalt Oxide gives a stronger colour than Cobalt Carbonate but has larger, coarser particles which can cause a grainy mottled effect.The exact composition will vary depending on supplier, but generally Cobalt Oxide is on average 1.4x stronger than Cobalt Carbonate.
Alumina = Green Chrome and Copper = Blue/Green-Blue/Green Chrome and Manganese = Blue-Black/Black Barium = Blue-Green Manganese and Selenium = Yellow Manganese = Slate Blue/Purple Manganese and Iron = Strong Black Rutile = Mottled and textured Blues with streaks Magnesium and Tin = Pink/Lilac Magnesium = Blue-Violet/Blue mottled with Red/Purple (with precise temperature control)