I'm in the same situation too with my current 67 NOR conv restoration and the clips I got from In-Line. I have the original ones I took off in the 80's and those that are in fair shape to display a finish show no red color. But that's not to say it hasn't faded but I would think the rear parts that are against the chassis would retain something.
My 67 LOS survivor that has original fuel and brake clips preserver in a layer of grime are clearly phosphated. I may take the repo ones and glass bead then phosphate
unless there are others here who can say they have seen colored ones.