It has had no votes, no comments, no answers.
Given the popularity of etching, I'm surprised this has neither been covered before, nor seems to have readily available answers.
Although I understand that the question diverges from industrial practices, so readers might only open the question with a preconception that it's about a common industrial method they are familiar with, only to find it's not something they can readily answer (since DIY requirements are very different)
Could the question perhaps be split up into specialist fields, thus enabling different people to provide answers to the different parts? I'm clutching at straws.
The only real barrier I sense is that I have not specified what household waste disposal regulations/restrictions are in the UK; could this be why?
Any help would be greatly appreciated!