Manufacturer and builder 4, 1879
We would suggest that you use in the stain liquid ammonia instead of coda. This may cause the stain to penetrate in spite or the oil do the leather, while afterward, being volatile, it will evaporate and leave no injurious remnant, as is the case with soda. To produce a deep black, we would advise you to try a weak solution of bichromate of potash; this, with the tannin in the leather, produces a deeper black than the iron solutions usually employed. If it does not, you may afterward moisten the leather with logwood extract, which, with the bichromate of potash, gives a deep black. Use very little of the latter substance, as a small quantity goes a great way, and an excess may injure the leather.
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