SplinterGroup 
..... but I also had the same issue with color in the pores. Nothing like sanding it until the pores disappear or the veneer is sanded away.
.....

 SplinterGroup 
..... I finally decided to cover panels with tape before etching and filling the framing pattern. At least it kept the gook out of the pores, but then you loose that "antiquing". Still had to sand so removing the tape wouldn't pull out the fill, but made it fun to see the panel get exposed. Just like opening a gift..... 
Gents, I've formulated a response to this, however, it may get better exposure for people seeking laser details more specifically so I've posted it in the "Laser thread"

If your first cut is too short... Take the second cut from the longer end... LBD