Pera Crasidine comes in the form of light-brown coloured flakes or fused mass; it turns dark on exposure to light.Keep containers tightly closed, store in a cool and well-ventilated area and away from oxidising agents. Avoid direct contact of material with air | oxygen to avoid colouration. Open and handle container with care. Always refer to the Safety Data Sheet (SDS) for detailed information on storage and handling.