| The tannage is mellow, but not so much as is usual for upper leather. |
| Another typical case of combination tannage is the Dongola leather produced by the use of gambier and of alum and salt. |
| For the tannage of sole leather in the drum by the cutiloid process, about 120 per cent. |
| His peat or humic acid tannage was patented by him about 1905, and is now worked on a commercial scale. |
| Certain it is, however, that time renders the tannage more permanent. |
| If for blacks the tannage is with gambier and chestnut extract. |
