You CAN NOT tell a het pied or anything else by a visual marker.

Yes, some hets do have markers, more do not. A lot of just plain normals have the same markers, so there is no way to tell by a marker if you have a het anything. Buy from a trustworthy breeder, or take a wild guess and try to prove it out.

Now, if the person you bought it from is 1000% reliable and can guarantee that one parent was a visual pied, then yes that baby would be a het. However, not every breeder is trustworthy so you have to take that into consideration.

Gale