In other words, a type of mineral made out of aluminum, silicon and oxygen. They can be found naturally and then mined, or they can be manufactured synthetically, writes Nera Leather Tanning.
Zeolites have a unique property in that they can absorb or release water, depending on the temperature. Water absorption is an important part of leather comfort, and a tannage that allows water absorption (without swelling) is a desirable characteristic.
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