I'm using an antiquing solution to color mounts and need help figuring out how to stop the coloration process. I dip the mount into the antique bath, then dip into water, lightly scrub with a sponge to take away the glimmery patina, and then dry and put away. Weeks later, they turn silvery and uneven. Recently, we started using a randomly concocted baking soda + water bath (the company that sells the antique solution did not know what ratio to use of baking soda to water) but I'm hoping someone has had more experience with this and can advise - does it work? What ratios do you use?