(info2 at healthynaturalcolor dot com) quercetin and phenolic glycoside are the main parts of the vaccinium bracteatum thumb leef color color.we can see blue-black extractive with our naked eyes.the stability of the pigment under acid-forming condition seems good. it is absolute a natural pigment abstracted from the leaves of vaccinium beacteatum thunb by modern biotechnology .widely used in protein,hair, starch, white vinegar, salad oil as natural coloring. this product has been exported to eu, japan, usa, asia etc. the physical level and microbiological level can meet the export standards well.for avoiding fakes,this product already has normal enterprise no: q/kle93-2005. package: cardboard drums, with double aseptic food poly bags inside, 25kgs per drum. or by aluminum foil drums, with vacual aseptic food poly bags inside, 0.5-5kgs per packet. mail box: info2 at healthynaturalcolor dot com tel: 0086-452-6101658 fax: 0086-452-6101659 web: www.vipblueberry.com