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Thanks, guys, for your comments.

I do NOT have pinholes now, I am just worried that the green stuff or flux residue from the C-Flux might cause problems over time. Do I need to be concerned about what is already in place? Better to use water soluble flux in the future?

While making plumbing changes in my house recently, I removed a section of supply copper pipe (cold) that was installed about a year ago and noticed that there is a green residue about 1" to 2" lengthwise, on each side of the fittings. I was told that this is "patina". Most of it does wipe off...