Carmine powder
Synonym: Alum lake of carminic acid, Cochineal, Nacarat, Natural Red 4
CAS Number 1390-65-4
solubility ammonium hydroxide: soluble1 mg/mL
Packaging 5, 25, 100 g in glass bottle
5G - 62.90 EUR
http://www.sigmaaldrich.com/catalog/product/sigma/c1022

Carminic acid
Synonym: Natural Red 4
CAS Number:1260-17-9
Packaging 1, 5 g in glass bottle
absorption λmax 495 nm
1G -83.40 EUR
http://www.sigmaaldrich.com/catalog/product/sial/229253

Cochineal (the primary extract) is a purplish-red liquid, water soluble and susceptible to microbial degradation if not handled with care. For this reason, it is often subsequently tray dried or spray-dried. Cochineal is therefore available as a liquid (variable amount of carminic acid below 5%), crystal form (usually 95-99% carminic acid) and powdered form (about 50% carminic acid). Cochineal is pH sensitive, as it is orange-yellow below pH 4, wine red from pH 4 to 6.5, and purple-red above pH 6.5. Cochineal extract has found application primarily in the beverage industry. Its solubility in aqueous acidic systems and absence of aluminum content favor broader application.

Carmine is made by precipitating carminic acid from the primary extract onto an alumina hydrate substrate, using aluminum or calcium cations. This precipitate is a "lake" and is traditionally dried to contain about 50 to 53% carminic acid. Carmine is insoluble in water and oil. It is stable if pH is held above 6. It is soluble in alkaline solution, where it is a bright burgundy/violet color. Liquid carmine is usually offered as a 3% to 7.5% carminic acid content in an aqueous solution, alkalized with ammonium or potassium hydroxide. Great care should be taken when working with carmine solution prepared with a hydroxide. This is a strong alkali and workers are advised to avoid splashing and to always wear safety glasses. Request a MSDS from the supplier relative to the alkali used in the colorant’s preparation. Carmine will precipitate out of solution at low pH. It is stable to light, heat, oxidation, storage time and is the color of choice in harsh processing applications.
Carmine’s only significant technical limitation is that it will precipitate in low pH solutions. A Peruvian company obtained a U.S. Patent on an acid-proof carmine product and ColorMaker can source this colorant. In powdered form, Carmine has been used for cosmetics, pharmaceutical coatings, dry mixes, surimi, fillings, cake icings, and hard candy. In the liquid form, it has found application in coloring bakery products, icings, yogurt, candy, ice cream, gelatin desserts, various milk-based and alcoholic beverages, fruit syrups, pet foods, fish cakes, jams/preserves, meat products, marmalades, hair and skin care products, soap, shampoos, lipsticks, face powders, rouges, and blushes.
http://www.colormaker.com
http://nutrafoodingredients.com/prod...hineal-carmine