Ascorbic acid is a naturally occurring organic compound with antioxidant properties. It is a white solid, but impure samples can appear yellowish. It dissolves well in water to give mildly acidic solutions. Ascorbic acid is one form ("vitamer") of vitamin C.
A 2659 (OTTO) L-Ascorbic acid, spezial coat grade, 99.7% Cas 50-81-7 - used antifade reagent in live cell microscopy.