No. Caviar is a natural product, and natural products vary in color, texture, and consistency. Among Beluga, Sevruga, and Osetra, for example, colors can range from silver-gray to brown to black; although Beluga is generally grayer and Osetra more black. There is rare golden Osetra (coming from albino fish, the roe is actually yellow, and extremely costly due to the rarity). But the color of the roe is an appearance quality solely and does not affect the flavor.