Teach Soap

Unless you know what oils are exactly in this mixture, you won't be able to create a proper SAP value and thus proper amount of lye. I wouldn't do it.

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Irena
Closed minds are like faulty parachutes; they refuse to open.

Why yes, I would love to wash myself with leftover bits of french fries and stir fry. I could take that "fast food" smell with me wherever I go!

Sorry, totally don't mean to rag on you, although the idea of not knowing what the heck is in my soap, even after the chemical processes, is kind of scary. Keep in mind that I'm even more of a newbie than you, though (have yet to make my first batch, still in the "obsessive reading" stage) so don't take me seriously!

Perhaps you could use the waste oil in biodiesel? There was a post on another soap forum covering that- the guy got into soap making when he didn't know what to do with all his extra glycerin:

http://www.soapmakingforum.com/forum/vi ... php?t=5236

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Irena
Closed minds are like faulty parachutes; they refuse to open.

My Father-in-law has been doing a little bio-diesel and in order to find out what the value of the oil is, you need to Titrate it. You can do this easy enough, but the used oil he has been getting is so nasty!!! He strains it a lot but even so, I would never use it for soap - it would waste your lye !
If you want a cheap oil for practice, use something like Crisco. It's not that great for soap ( some people like it fine - but I don't at all!) but at least you can use the end product!

Personally I'd feel safer straining the oil and putting it in my Jetta TDI than in soap. You could take it anyways and find an adventurous person with a diesel vehicle!

Even if the vehicle hasn't had any biodiesel mods put on it, the car will be just fine with a % of the tank just veggie oil as a one time thing. Anything more than that, you're better off with a real biodiesel setup, kinda like what was on Dirty Jobs a few years ago.

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Not So Plain Jane Jewelry
Silver City, NM

(Plain oil )Tried this - it makes the car stall all the time. No umph to the fuel I guess. You really need to do the whole BD process.

Why not start with 1lb. batches of soap that way you can try several diffrent recipes for very little money . The cost would be minimal and you'll have good soap to use. I lucked into my recipe right off the bat , but I did a heck of alot of reading first .