The most common leather tanning chemicals include vegetable tannins (extracted from tree bark), syntans, alum, glutaraldehyde, formaldehyde, and heavy oils. Chrome tanning by leather tanning chemicals is the most adopted tanning process by manufacturers; this process is most efficient and less toxic than hexavalent chromium.
Though the vegetable tanning process is a traditional process, it is a process without using harmful chemicals. Vegetable tannic acids are naturally found in some plants, by using the branches, leaves, barks, or even some fruits in some specific techniques. In order to make leather soft and pliable for use, the leather tanning chemical process is necessary during the preparing of leather. With the growing demand for technologically advanced and efficient processes for leather tanning, the demand for the leather tanning chemicals has escalated
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