It is funny I just finished one of my insane projects LOL
Project: make the Red Tabby pure.
OMG that was kind of a challenge because the only furs more dominant to the red are the Genesis so I needed to hide the red behind a genesis

I just tested both sibs which should hide the Red Tabby with help of very recessive test kitties and YAY they both hide it the red.
Breeding dominant can be hard as well but I love those type of challenging projects somehow.
But I can finally start to produce my pure red heads :-)