Acid Red A jẹ Dudu pupa lulú.Tiotuka die-die ni acetone, tiotuka ni ethanol, omi ati cellolytic (pupa).Acid Red A ni iwaju sulfuric acid ogidi, o wa ni buluu-violet, ati lẹhin fomipo, o wa ni ojoriro-ofeefee-brown;ni ogidi nitric acid (ofeefee ina pupa);ni dilute sodium hydroxide Ojutu naa jẹ brown pupa pupa pẹlu isodi dudu.Nigbati o ba n ṣe awọ, awọ ti bàbà ati awọn ions irin jẹ dudu.Yato si, Acid Red A pẹlu itusilẹ awọ to dara.