Popular Mechanics, tammikuu 1915
If kept in tin cans, white shellac will often lose its color and turn a rusty brown. it can be restored in the following manner: Pour it into a wooden pail and stir with along stick reaching to the bottom of the pail, at the same time adding dry oxalic acid, until the whiteness returns; then strain through cheesecloth into another can. White shellac, if kept in glass, stone, or wooden jars, will not lose its color readily.
- Contributed by G. P. O'Brien, New York, N. Y.