Grape seed extract Appearance: Red-brownish powder Identification : Positive reaction Product specification: Item Index Proanthocyanidins % e 95.0 % e 150 pH 2.5-4.5 Loss on drying % d 5.0 Sulphated ash % d 0.5 Heavy metals ppm d 10 Iron ppm d 10 Slovents: Ethyl acetate Negtive Chloroform Negtive Toluene Negtive n-Butanol Negtive Acetate Negtive Ethanol