u/External-Force3639

Hi all,

So I have been working on this piece for awhile. It has some very small pieces in the wave, which I was finding difficult to control, so my solution to this was to solder the back of these parts.

What I have found is after leaving them alone for awhile I now see some sort of white mold on the front foil and a green mark on one spot.

I'm wondering how I can deal with this and whether it will cause a big problem when soldering the front?

For reference I am using liquid zinc based flux and lead-free solder