Type type and temperature transferral

I have a business card design locked up for hot-foil stamping which consists of 2 sizes of century schoolbook (12 and 10 or 8) I think the smaller type is foundry type and the larger is monotype (I know this isn’t good for the type, I’ve decided to make that sacrifice). When the larger type prints crisply the smaller type is all filled in with extra foil. Is this because the 2 different metals are transferring the heat differently? When held to the light the impression made by both the small and large type is nice and crisp. Any insight would be most appreciated! Thanks

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Different metals will transfer heat differently. You could try turning the temperture down to get rid of the fill in. You could also take a piece of cheesecloth and wipe the excess foil off after you have stamped them.