I just recieved a a nice brochure from a guy named Jim Hillestad of
www.the-toy-soldier.com, he sells beautiful display cases, yeah I'm still looking at ways to display my slowing growing collection. Anyway, some of his toy soldier tips are;
Aviod halogen and incandescent blubs, they damage the paint, use fluorescent.
Don't hermetically your collection, i.e. lucite boxes, glass domes and tight-sealing doors, they need air circulation.
Keep as dust-free as possible, dust can absorb and hold moisture.
Store them in lightwieght paper, like tissue, and place in cardboard box in a dry place, excessive humidity and high heat are not good environments.
Do not put figures directly in foam cutouts, paint and foam can both contain petro products and interact, again, wrap in tissue and do not use plastic bags useless they holes for moisture release.
As mentioned before in this thread, don't worry about handling the figures, the oils in your hand are good for them.
Hope this helps, but I sure all you old pros know this stuff already.
Fred