Candle and soap making is one of my hobbies, *wink*
I was browsing ebay and found this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2331677172 (http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2331677172)
That auction even gives a little information on the chemical composition so maybe you can find some solubility data.
Have fun with whatever your doin
-blaaky