potassium dichromate, di-ammonium prosphate and sulfur powder in chemical watch glass. close up chemical ingredient on white

acid ammonia background chemical chemistry close compound crystal diammonium dichromate drug experiment fertilizer flake flat glass health hydrogen industrial industry ingredient inorganic ionic lab laboratory material medical mineral natural orange organic pharmaceutical pharmacy phosphate potassium powder prosphate pure red research sample science sodium sulfur sulfuric sulphur table test top toxic treatment view watch white yellow