“”Probably a solution made with lime.””
I’m sure I would have recognized that as we also used lime on the farm - before we had a bathroom - so you can guess what that was for!! LOL
It was a jelly like substance and you had to dip your hands down into it to find the eggs.
I’ve never done it myself but am thinking of trying. A web search will turn up many different ways.
It was probably water glass, or sodium silicate.