Examples from the Web for tannage
The liquors may be warmed; this quickens the tannage and also leaches the sumach.
Mrs Wilson's a throughgaun quean, and clears mair than a hunder a-year by the Tannage.The Shepherd's Calendar|James Hogg
If small skins are being tanned for bookbinding purposes, sumach only is employed, and usually the tannage is entirely in paddles.
The tannage is largely with gambier and in weak liquors, which also help to give smooth grain.
Further disadvantages arise from the fact that the chrome tannage is an "empty" tannage.