Here is 500 grams of Reagent ACS grade Tannic acid. Material is a yellowish powder. Not the cheap, lower quality material that is brown from China. Certified ACS from a major US supplier. . It contains 96% minimum Tannins. I have a C of A if needed. Current catalog price is over for this purity. Good luck!! Buyer must be 21 years of age. Buyer assumes all liability for the use of this item. Buyer agrees to not hold the seller or Ebay liable for the use of this item. Buyer agrees to use this item in accordance with all local, state, and federal laws. This is for laboratory and scientific use only! Shipping will comply with all USPS regulations. Item is NOT regulated by the DOT.