Copper solder safe to wear

At the stained glass studio I work for, we are getting lots of
questions about copper solder. One of the hot “jewelry” items right
now is the jewelry that is put together foiled like stained glass,
and then soldered with lead free solder.

We’re hearing now that some people are using a copper wire solder
that is 92% copper and 8% phosphorous. It also contains it’s own
flux, and has a 1350 degree melting point. (Are they using a torch
for this instead of a soldering iron???)

What I’m wondering is if the phosphorous is safe to wear against the
skin after this has been soldered on. I figured with the knowledge
here, this would be the place to come for info. Thanks for the help
in advance! I don’t want to steer our customers wrong!