PE and Kirk,
I will NOT use denatured alcohol. That is why I paid $13 for 1 pint of ethanol from The Science Shop. The 70% ehanol is sold as "rubing alcohol". So the added chemical is probably something of low toxicity, like IPA.
I will just wait untill the ethanol arrives, then try to find ivy in the desserts of southern CA. Maybe spinach is not a bad idea Kirk.