I do not understand why speech about glass etching is off topic, in a thread titled “glass jar printing removal”. Clearly etching glass with an acid is one method used to print upon glass. No doubt many a fool has tried to wash such etching off a bottle. Why is it off topic?
Real HF is mainly used in manufacturing environments; for etching even things like electronics perhaps. But today's best precision glass artistry is preformed with laser etching along with hydrofluoric acid together. (Well the UV cured
ceramic ink that
HDBN mentioned, is kewl too).
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https://www.glassetchingsecrets.com/acid.html
The same person that wrote the above also wrote this”
https://www.glassetchingsecrets.com/blo ... m-made-of/
The list of ingredients mentioned in his version of Armor Etch differ from what
Yummrum listed. It is evident though that there are several different recipes on the Internet, even for making your own etching cream concoction.
(From the 2nd link) listed in MSD: are
Barium Sulfate
Sulfuric Acid
Sodium Bifluoride
and Ammonium Bifluoride
So this is all new stuff for me; new topics. I have no formed opinions, only a desire to learn. I don't know if or when a used Mexican tequila bottle is made of borosilicate glass, fused quartz glass or soda-lime glass. And I bet other readers here don't know the difference either.
But I am confused as to why the very composition of a glass bottle or “jar” would be considered “off topic” in a thread that portends to discuss glass jars and any printing upon them... Do I need to go make a different thread, with almost the same title ?
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A little additional information, that hopefully does not break the camel's back.
(ammonium and sodium bifluoride both, are listed as ingredient in some versions of Armor Etch).
QUOTES: (source)
https://www.finishing.com/94/62.shtml
"Ammonium Bifluoride, NH4HF2, is a weak acid salt of HF. If you add Sulfuric or Hydrochloric acid to the ABF you will have more HF in solution than with just the ABF. You will have to do some chemistry to figure the molar amount of acid needed to get the equivalent amount".
"Some folks have used ammonium bifluoride as a substitute for HF and created (what they refer to as) an "acid free" wheel cleaner -- it's a dangerous and deceptive practice".