This type of Till Roll does not require any Ribbon/ink to print on.
When one uses a thermal roll a thermal head is used to “burn” the information onto the paper. If one is not sure if their till rolls are thermal a simple test can be done by holding a flame under the paper or by scratching the label with a pointed object.
If the label shows a black marking where it was scratched or turns black when using a flame then your till roll is indeed a thermal roll.