...it's not illegal to sell black electrical tape. 
A black toy with black tape over the orange tip looks... yup, black.
Year before last I took my daughter's car in for emissions inspection. It passed the hose in the exhaust test but failed because the "check engine" light was on. (Not sure what was the cause but they discovered the check engine light lit spuriously due to a looses connection that began when she had the faulty stereo replaced.) So they charged an hour's labor for the diagnostic work and passed it.
Last year it lit again during the inspection and they were going to fail it and start diagnosing until I stopped them. (A different mechanic) I recounted the story from the prior year and said if I can have some electrical tape, I can fix the problem. I did my thing and he checked the light and it was no longer lit. He asked what I did. I said I put tape over the bulb. 
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