The Sprint Quicksilver Black & White Print Paper Developer has pyrazolidone-hydroquinone as a developing agent.  It is a high-capacity developer used with black and white prints with neutral tones.The developing agent in this developer offers precise control over the print density, color, and contrastThe quicksilver in this print paper developer provides the black and white prints a neutral tone, which does not differ from highlight to shadowQuicksilver used in this developer does not cause any skin rashes as it does not contain metol