I hadn't used my gold plating solution for about a year and when I went to use it the gold had deposited on the sides of the bottle. I have only poured solution out of this bottle and haven't poured any used solution back in, so I don't understand why this happened. Shaking the bottle has no effect. Is there something I can do to get the gold to redissolve in the solution? Thanks for your help.

Regards, Larry