Shouldn't have. I'm still using old lead solder from 20+ years ago no problems.
It has a very valuable role in certain circs; I'll leave that to someone else to expand on.
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The description on the container is far too vague for my taste. If you're u sing that on a PC board I don't trust it. An MG Chemicals 935-P flux pen is much preferred. At least you know what's in it.
So, it's probably the century-old formula of ZnCl2 suspended in petroleum jelly. Paste flux of this sort is convenient for copper plumbing use, and is only slightly messy, BUT isn't generally an electronics aid.
The chlorides will wash away with water flow, and it is common procedure to use a rag to clean the exterior of each soldered copper pipe joint, but if the stuff remains, it can corrode the metal parts (and it's hygroscopic, so it attracts moisture that causes dissimilar-metal reactions).
More here: Not recommended for fine wires or printed circuit (thin) sheet copper. Folk have used it for vacuum piping, but (because it does NOT get washed away) that's the beginning of a horror story...
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