K1p1 rib using 2 colors?

Hello!

So I noticed in a baby sweater that I’m knitting that when you do a 1x1 rib, the p stitches kind of pull back and disappear when it’s not stretched. My question is: If I did all the purl stitches in a contrasting color, would they still disappear, being visible mainly when stretched? Or would switching between yarns every stitch change how it behaves?

Hope that makes sense. Thanks, knitters! I’m new on the forum and look forward to learning from you all!