Abstract: Grape pomace is contacted with an aqueous extraction solvent containing HSO.sub.3.sup.- ions to form anthocyanin-(HSO.sub.3) complex. The complex is recovered by treating the liquid extract phase with a non-ionic adsorbent to adsorb the complex. Anthocyanin colorant, free of the HSO.sub.3.sup.- ions is recovered by elution with an acidified organic solvent for anthocyanin. The anthocyanin colorant may be provided in dry form by drying the solvent solution. This process allows us to remove sugars, organic acids, polymerized anthocyanin pigment and other water soluble material, thus providing a highly "colored" monomeric anthocyanin pigment. The anthocyanin colorant produced by this process is at least 10 times more concentrated than that produced by conventional methods and about two times stronger than most of the concentrated pigment.

Abstract: Spirulina blue, which is not soluble at low pH, is subjected to enzymatic hydrolysis in an aqueous alkaline medium. The pH of the aqueous system is lowered and the liquid phase is dried to produce a blue dye in dry form which is soluble at low pH. The blue dye is useful as a blue colorant in food products, particularly food products, such as beverages, in which acid solubility is desired.