5 ms·
Acids and etching solutions have been used to do this for many years. It takes longer, hence the relevance of this discovery, but it does often work long after
by sfeng 12y ago
Acids and etching solutions have been used to do this for many years. It takes longer, hence the relevance of this discovery, but it does often work long after the numbers are obliterated visually. My understanding is, similar to this method, it relies on the structural changes made in the underlying metal when the upper layers are stamped. It goes to show you just how tricky materials engineering must be, seeing how the structure of a material can be so easily changed in an invisible way.
- NoMoreNicksLeft 12y agoSo keep grinding even after the serial's no longer visible?
- iwwr 12y agoOr re-anneal the materials in an oven?
- TrainedMonkey 12y agoPutting parts of firearms in the oven, does not sound like a safe thing to do if you are planning to fire from them afterwards.
- busterarm 12y agoBut totally the right thing to do with firearms you're trying to dispose of.
- Crito 12y agoI wonder if peening might be sufficient. http://en.wikipedia.org/wiki/Peening http://en.wikipedia.org/wiki/Peening
- MichaelGG 12y agoI'd imagine it might be more important to apply the same type of pressure as the stamping process. Assuming there's some maximum compression or structural change that can happen?