For those that are stamping their leather, here is a great words of wisdom from Silverback to get your stamped images work out good and with high contrast.
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1. Lightly wet the leather until it just darkens a bit,
2. wait till it comes back to its original colour (dried out),
3. as soon as it change to its original color, hit (or clamp on) it with the stamp.
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For those with large stamps, you would only need to clamp or press on for about 5 seconds.
For those with small stamp with stem, you only need to tap the stamp on with one firm tap.
Follow the above steps and you should then get that nice dark brown burnish colour in your impression.