First try with SS media, brass is rainbow colored

[Webster]

Rainbow coloring is from lack of rinsing and not enough citric acid. You need to run those pins by themselves for a day then rinse til theres no more metallic water. Id do this with a full drum and dawn maybe 2 spoons. You can run that brass again once you do all this with your citric acid added. I use real lemon from the fridge

I don't even measure Dawn & LemShine, just eyeball from experience. My cases are always bright and shiny. I rinse in $1.00 a gallon distilled water that sells everywhere for steam irons, not drinking? You can do a lot of cases in 1 gallon. You can reuse it a few times. The citric acid in LemiShine is what brightens them up.

 

[Dusty Stevens]

I don't even measure Dawn & LemShine, just eyeball from experience. My cases are always bright and shiny. I rinse in $1.00 a gallon distilled water that sells everywhere for steam irons, not drinking? You can do a lot of cases in 1 gallon. You can reuse it a few times. The citric acid in LemiShine is what brightens them up.

Exactly

 

[cw308]

I switched to wet tumbling with SS Pins after 25+ years , now it's years later and would never change back to dry . I also in the beginning experienced pinkish rainbow brass , what I do is I first add alittle water to the pins add the detergent mix it in add the brass and fill to a half inch from the top with warm water . I felt when I added the detergent on top of the dresser added to the discoloration . I use Sun Liquid Detergent after asking my wife why don't you use Dawn , Sun cleaned better and she was right . I stopped using LemiShine . I let the tumbler run for two and a half to three hours . Brass looks brand new each time.