User's Manual

http://www.woosim.com
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7) If the surface of thermal paper is scratched with a hard metal object
such as a nail, the paper may become discolored.
Notes on thermal paper storage
Since color development begins at 70C (158F), thermal paper should be protected
from high temperature, humidity, and light, both before and after printing.
1) Store paper away from high temperature and humidity.
Do not store thermal paper near a heater or in enclosed places exposed to direct sunlight.
2) Avoid direct light Extended exposure to direct light may cause discoloration or faded
printing.
3. Others
Because this printer uses plated steel, the manual cutting edge may be subject to rust.
However, this does not affect the printer performance.