This stuff is awesome.  My kids have caught poison ivy too many times but the SeeLeaf cloth immediately told us what plants were okay and which ones to stay away from.

The SeeLeaf technology is simple, reliable, and instantaneous. SeeLeaf alerts the user before serious exposure to the poison in the plant, the urushiol antigen, becomes dangerous. We have tested SeeLeaf in over 20 different plants and only those containing urushiol resulted in a color change. Thus, an individual who contacts poison ivy, oak or sumac will be alerted to rapidly wash their skin to significantly reduce the possibility of contact dermatitis. SeeLeaf  enables homeowners, hikers, and gardeners to easily identify poison ivy leaves and vines!