The NaCl mentioned in earlier postings is from the rock salt and brine that meat packing houses use to preserve the hide between processing and tanning. Commercial trials have been done and are continuing to replace NaCl with Potassium Chloride with very promising results in terms of hide stability and potassium carryover into the treatment residuals. The elevated NaCl is in the leather scraps, and the high nitrogen content of this material usually doesn't allow its use in too high a composting ratio anyhow. The whole trick with leather is in the grinding.
Leather is a non-woven three dimensional fabric with no shear plane.
In the last five years - with the word of mouth, and demonstrations on local fields we now have more demand than material. I know I am preaching to the choir on using organics, but the benefits of this material is stunning. I would be glad to send copies to interested parties of either of the two papers I co-authored on this research. I would like to know what results and situations have lead to some of the negative comments listed on this server. I will say again this material makes a beautiful compost if you take your time.