Riso: GR/RA/RC SERIES, S-539, S-569 S539 S569 Description: DUPLICATOR INK (BLACK) Models: Riso: GR1700, GR1750, GR2300, GR2500, GR2700, GR2710, GR2750, GR3500, GR3710, GR3730, GR3750, RA4050, RA4200, RA4300, RA4900, RA5900, RC4000, RC4500, RC5600, RC5600D, RC5800, RC6300