Is there an experiment I could do to prove that soap is made up of fat and lye?

Thank you for using the Jiskha Homework Help Forum. Here is a recipe for making soap:

Recipes From Scratch
Basic Recipes

Soap Crafters Castile (Non-veggie)
26 ounces of Olive Oil
60 ounces of Lard
11 ounces of Lye
32 ounces of Water
1.6 ounces of Soap Crafters Cold Process Soap Fragrance
Tracing happens in about an hour or so. If you stir for an hour and a half and it still hasn't traced, just put it into your plastic lined box mold. It should be fine.
This would be in the hard category of soap. It is quite white and resembles the color of cream cheese. :) When I was making my first batches of soap I used this recipe. When ever company came over and saw my bars of soap drying in the living room, they asked if it was cheese and they kinda wanted to eat it. But I wouldn't let them. ;)

There are many dangers working with lye:

http://www.pioneerthinking.com/soaps.html