Robert Oster Fire & Ice ink reviewed by Skribr. Robert Oster Signature inks are handmade in Australia and are inspired by the Australian bush. One of the most popular inks in the Robert Oster Signature ink range is Fire & Ice. Fire & Ice. Fire & Ice combines blue with a red overtone to create a unique effect when writing. Tested on Rhodia paper with a TWSBI Diamond Mini fountain pen.