There are actually 5 steps to correct leather ID visual, tactile, scratch, moisture and microscope. The IICRC in the UK covers all 5 of these tests rather than just the 3. These tests only take a matter of minutes to perform and can tell you a lot of information including what can be cleaned and what cannot as well as what type of leather you have. A simple 40x pocket microscope is one of the most useful tools there is in a leather technicians toolkit but it is surprising how few people use them (however, you do need to know what you are looking for)
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