It’s not like etching with hydrochloric acid and peroxide is anything new, really; it was just something new to him. But is it even possible these days to post something and not find out just ...

Here’s a demonstration common in chemistry classes. Two chemicals, hydrochloric acid and ammonia, are placed next to each other. They don’t touch. But one suddenly starts smoking. What happened?

In a very detailed and rather easy-to-follow instruction manual, the steampunk workshop teaches us how to use copper sulfate, hydrochloric acid ... give this a try for etching Altoid tins ...

ferric chloride, 2 ml. concentrated hydrochloric acid and 99 ml. methyl alcohol) etching for 20–60 min., revealed cracking as the principal deformation mechanism and twinning as the secondary ...