I don't know if Cylinder & Slide works on Rugers. If they do, there's nobody better.
Hamilton Bowen
Gary Reeder
I dunno about the color case frame. Ruger frames are fully heat treated, they are not case hardened. Their "color case finish" is just that -- it's a surface applied fake finish. I don't think you can apply a real color case hardened finish to a hardened frame without destroying the hardened properties of the steel.