Going slightly bonkers trying to figure out why my uni sub coasters (cork backed) are turning brown
i have a UkPress 38x38 Pressing for 60 secs at 180c
I use Teflon sheet over the top of coaster.
ive tried varying temp and pressure to no avail (also removing Teflon)
ive tried with sub paper and without to which I get sane brown result.
The photo attached is far left original white coaster far right being pressed.
if I press cooler or less pressure the image fades.
Any ideas?
Thanks!