What was the film? Foma films in 120 have a blue plastic base whereas other manufacturers have clear or frosty-looking bases.

Strongly coloured dyes coming out in a pre-wash is normal but it's not necessary to pre-wash most films. Most developers will eat the dyes and come out relatively clear, while Rodinal seems to just wash them out so it often comes out strongly coloured.

You might want to have a read through the FAQ in my signature.