Orange powder, soluble in water, soluble in alcohol, moderately soluble in benzene and ether, slightly soluble in acetone.

Mainly used for dye, acid-base indicatorFor soap coloring and silk, wool, paper, leather and other staining. A middle class drug, adult oral intake of about 25 g can be poisoned, the clinical manifestations of general malaise, dizziness, nausea, vomiting, loss of appetite, diarrhea, abdominal pain, severe chills, fever, fever, shortness of breath, etc. symptoms, skin and mucous membrane irritation.