Hot stamping foil adhesion is measured in a number of different ways, and there is a lot of misconception about what each test really measures. Take the simple scratch test for example. Is that a definitive adhesion test or simply a measure of the hardness of ones fingernail?
In fact, most adhesion tests carried out are comparative rather than a true measure. If you have two foils on the same substrate, both blocked at the same time, then you can test their comparative resistance to your fingernail, assuming that you do not subconsciously scratch harder on that you want to fail. This is more common than you might think, which is why a true scientific measure of adhesion is preferred.
However, such measurements are rare, and there is nothing that could realistically be routinely carried out by a trade blocker or printer. Even a rub or abrasion tester is not testing adhesion as much as the hardness of the foil surface. The so-called Scotch tape test is generally the most widely used, but there are so many variables involved, that again this is normally not definitive unless exactly the same tape is used each time.
Apart from the adhesion of the foil itself,...
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