When I hang an old metal clock on the wall, the metal acts almost like
a pencil and leaves gray lines or scuff marks all over the paint. These
lines won't easily clean off, either. What in the world causes this?
Even if I put Scotch tape over the metal that contacts the wall it
still does this. I've noticed that other metals will do this to paint,
like coins. Is the metal shedding a layer onto the paint? Or is the
paint reacting somehow to the metal, which occurs even through a layer
of Scotch tape? I've searched all over the internet but couldn't find a
discussion of this phenomenon.
An exterior wall? likely the cold is kept behind the clock and condenses
a bit in winter, it could be mold or a reaction from moisture and
metal. Touch an area with bleach to see if it dissapears in a few
minutes, if it does dilute a mixture you might be able to kill it
without ruining the paint
White paint ?
I've only seen this on white
the primary white pigment in paints was white lead
I can't remember if it was the white lead or one of the replacement
that caused this maybe Titanium Dioxide pigment with aluminum oxides
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