Citric acid is a natural, weak organic acid that is found in many fruits and vegetables, especially citrus fruits. Citric acid is prized for its sour flavour, preservative quality, and ability to act as a pH buffer. 30-100 mesh size (0.150-0.600) mm - the finest particle size available This is a food grade product of the highest quality. Perfect for bath bombs. 1kg and 5kg comes in a grip seal bag.