When performing tests for oil and grease using an ultra-violet light, the NACE Inspector should be aware that:

When performing tests for oil and grease using an ultra-violet light, the NACE Inspector should be aware that:
A . Chloride salt may produce a false positive
B . Synthetic oil or grease may not be identified
C . Ultra-Violet light may contaminant the surface
D . Presence of weld spatter may produce a false positive

Answer: B