I came across this tutorial a while ago detailing how to etch PCBs using common household chemicals instead of ferric chloride. Being a lazy person who doesn’t want to drive out to Sayal (in Cambridge) to get ferric chloride, I decided to give it a shot and take pictures documenting the attempt. Here’s the result:
As can be seen from the last picture, I left the board in the etchant a little too long (it was more active than I expected). Apparently, after a few uses it becomes a little slower acting, although I’ve considered using this effect to somehow watermark my boards.