My apologies to StopPolloition, Huntsman, and the other readers of this forum.
I had a search around for methanol, whiskey, and so forth, on Google and it seems that my source must have been confused about where the dark colour of whiskey, bourbon, and scotch came from, and the presence of methanol in badly distilled liquors.
As for the bit about preservatives, I found this interesting list of preservatives from 200 to 290 -
http://www.mbm.net.au/health/200-290.htm. Interestingly enough, several of the preservatives are flat out banned in AU, so I guess my headaches caused by cheap beers is just a mild taste of some of the junk other people have to put up with.
This other page -
http://www.answerbag.com/q_view/470770 - has an interesting discussion about the nature of beer and added preservatives - although it's obvious now, I'd never thought of alcohol as a preservative in itself.
Here's a good page -
http://www.allergycapital.com.au/Pages/alcoholGP.html - detailing the processes leading to the use of preservatives, eggs and milk, in the production of wine.
After further reading it looks like there's a real mixed bag of opinion about preservatives in alcohol. The general consensus seems to be that beer shouldn't have them, wines sometimes need them, and I seem to be having trouble finding information about preservatives in spirits, like whiskey, bourbon, gin, and vodka, so either there isn't and my less than scientific methods of study lead me on an erroneous path of opinion, or I'm going to have to wade through pages of results about wood varnishes before I find them.
*shrug*
Live and learn.
