ORIGINAL: wcmorrison
Well, tow things come to mind.
1. A little Castor never hurt anything.
2. Ask for a MSDS, the law requires that the fuel contents be explained for safety purposes in the MSDS for possible treatment and remediation. That is an OSHA requirement, it is the law. The fellow can be severly fined if he is selling this stuff and does no have an MSDS registered. If he is giving it away, well that's another matter.
Good luck,
Chip
The MSDS will not necessarily give the exact percentages of a formulation. Everything that is required to be listed can be in a range such as Nitro:5-85%, Methanol: 10-90%, etc...
....and if he has a trade secret in there it has to be listed if it is in percentages greater than 1%, but the exact chemical compound does not need disclosed, just the properties, health, fire, disposal and transport measures.