Depending on the type of fish and any additions, caviar, also known as roe, can be any shade of red, orange, grey, brown, or black. Osetra, for instance, is orange, whereas trout caviar is grey to brown.
A different sturgeon type, Sevruga, is small and greyish. Beluga caviar is made from pea-sized, silver-gray to black eggs with a black mark. Common small caviar from lumpfish is frequently painted red or black.
Whitefish caviar is golden-yellow, while American caviar from paddlefish is grey. Larger, deep crimson to pale orange roe are produced by salmon. Tarama, roe from carp, is similarly orange.