On Sat, 12 Feb 2005 13:41:27 -0800, Tim Wescott
wrote:



Yes, that's often an issue with me when I visit the local feed store for
wingnuts. Older potmetal is very hard to tell from titanium. I always
bring a pair of vice grips to the store and twist on the wings: if you
can bend the little wings into a pretzel shape and have them spring back
you know it's titanium. If they break then just kinda kick them under
the shelf.

Just ask the guy for some of the copper sulfate they use for control
of aphids, cabbage worms, adult fungus gnats, mealybugs, mites and
thrips. A drop of copper sulfate solution will make a black spot on
potmetal, has no effect on aluminum or titanium.