According to some webpage, your thermal cash rgister receipts can be brought back to life by
Apply Heat to Receipts
Apart from the obvious benefit of using receipt scanning API, there are other means of recovering receipt characters and information. One of the more trusted ways is to apply heat to the thermal paper.
All you need to do is to point a hairdryer to the reverse side of the receipt and hit the button. Keep heating the receipt up until the characters begin to become visible. Always use a low-medium heat on your hairdryer ? if not, an accident may occur.
Alternatively, you can apply the heat of a light bulb to the reverse side of the receipt until the characters become visible enough to be seen with the naked eye. Don?t apply heat directly to the front of the receipt as this will cause the ink to bleed into the paper and make any information even less legible.