The difference between sulfur yellow powder and sulfur flakes is only the difference in physical form, one is in powder form and the other is in flake form, with the same chemical composition and use. Apart from differences in shape, the purity of powder is higher than that of blocks.
Sulfur yellow powder has many functions and is not widely used in various industries. Moreover, sulfur is a low-toxicity hazardous substance, but its steam and sulfur dioxide produced after combustion are highly toxic to the human body. Generally inhaled, ingested, or absorbed through the skin. Excessive sulfur enters the intestines and quickly oxidizes into non-toxic sulfur compounds (sulfates or thiosulfates), which are excreted from the body through the kidneys and intestines. Unoxidized free hydrogen sulfide has a toxic effect on the body.
Hydrogen sulfide is a strong neurotoxic substance that has a significant irritant effect on the gastrointestinal mucosa and respiratory tract. The higher the concentration, the more pronounced the systemic toxicity. Hydrogen sulfide binds to trivalent iron in oxidative cytochrome oxidase, thereby inhibiting enzyme activity and disrupting the redox process within tissue cells, causing tissue cell asphyxia and tissue hypoxia, manifested as symptoms of central nervous system and asphyxia. So, be careful when using sulfur powder to avoid personal injury.