Lead Paint Test - Inconclusive

[Jesse Smith]

I purchased a lead test kit from Lowes to test for lead-based paint on the exterior of a property.  This one is badly in need of a strip & re-paint.  I know the process is significantly more intense if the current paint contains lead.

The kit I used is supposed to turn red in the presence of lead.  The tip of the tester stayed yellow, but there was some slight redness from the testing solution on the house.  Can any of you help me interpret this result?  All positive tests I've seen ARE BRIGHT red.  Thanks.

Images: http://imgur.com/gallery/TEqS4Tl