RW cards are available for black monochrome printing.
The rewritable printing technology does not require a ribbon to print cards. The card
itself have a thermo sensitive material which turns visible when it is heated to high temperature about 180 degrees
Also, a lower temperature of about 110-160 degrees celcius range will erase any colour
This process leverages two checmicals which interacts with each other according to
selected temperature tresholds.