Tnning Flux for lead spray guns

Have found two cases (24 bottles) of Brent's Cold Tinning Reviver- Quart size bottle, This is used with an old lead spray gun by Brents, etc. After cleaning metal area to be leaded you wipe the area with this liquid and it turns the metal copper color.D.Ziegler, 310 Jambore, ballwin, Mo 63021