Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Eric Edmondson" <eric_edmondson@...> wrote:
>...
> Ok, so after building and profiling my print environment, I converted an
> untagged RBG gray patch file to the new CMYK profile in PS, using relative
> with BPC.

I freely admit to paying too little attention to the details of this thread so maybe this is irrelevant, but this step fails to make sense to me. There is no, nor can be, any icc conversion from an unknown source space. If it is indeed untagged then a source space will be assumed, either done in Photoshop, or the RIP...
So, is a source being used by default that turns out to be useful for this workflow? Or is there perhaps a more useful tag for the intended result?
Tyler