How can you use mordants to brighten color or preserve it on metal?
I quote from my dictionary, Webster’s Universal College Dictionary–
mordant, adj. 1. sharply caustic or sarcastic; biting; cutting: [as
in] mordant wit. 2. burning; corrosive. 3. having the property of
fixing colors, as in dyeing. --n. 4. a substance used in dyeing to fix
the coloring matter. 5. an acid or other corrosive substance used in
etching. --v.t. 6. to impregnate or treat with a mordant…
In the case of fixing colors, whether it’s dyeing yarn, preserving
the color of cucumbers for pickles, or patinating metal, mordants (not
the etchant type, but the salts, alkalis and acids added to coloring
agents, such as liver-of-sulfur) can serve to intensify, clarify and
provide more durable color, than just the coloring agent by itself.
Some of the typical mordants used in patinating metal aRe: ammonia,
salt, sodium bicarbonate, epsom salts, vinegar and lemon juice. A note
of caution: an alkali and an acid should never be used together, as it
results in a very stinky mess, particularly if you’re using
liver-of-sulfur. Remember your science project as a kid, making a
volcano with dirt, mixed with baking soda, and adding a little
I hope this clarifies without being considered a mordant remark.