izafireman
Well-Known Member
In the video I saw that Steve linked for me the chap used the jar in boiing water and while the water boils the acid need not do so but it definately get up to a good heat which helps to speed the etch.
Thanks for letting me know, I had a chat with my neighbour who is an ex chemistry teachers and he has a test tube that's about a foot long and 1.5 inches wide along with a clamp and stand to hold it is place, just happens to look the perfect thing for heating the acid in and dipping the blade in safely as only a small volume of the acid Is required.