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What printer are you using?
It could be the temperature of iron is not hot enough or the copper is not clean enough.
There maybe many reasons. Maybe the Photo Paper you are using.
If you don't want to try multiple types, you might want to just go for the high gloss magazine paper.
It also maybe the Printer or a business Colour Laser.
I think there is something about the toner used.
Pretty good and useful info for beginners.
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