MIGNAL":1jkcjl2j said:Woods that are naturally high in tannin (Oak, Walnut) will turn Black with the solution. I don't bother with the wirewool/vinegar but use ferrous sulphate instead. I suppose the tea is used to introduce tannin. I use Walnut for thin inlay, coiling it up inside a large pan with the ferrous sulphate solution. It's boiled for a lengthy period to get it to penetrate to full depth. 1 mm depth is possible, any deeper and it will need a very lengthy soak or the use of pressure.
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