what causes this

[chucky]

as title says, what causes these white rough lines on the image, too much heat, too less. They seem to fit in with the burn marks left on the sub paper
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[chucky]

ok, I think I have solved the problem, I set the temp now to 150c and 3 minutes, they are coming out much

[Ian Mc]

Just for future information, it was probably paper sticking to the coating - a by product of too much heat or pressure.

[Paul]

150c???? try 180c for 3min.