Another way to make a homozygous recessive heterozygous another recessive would be to breed the double homozygous animal to one of the visual (or heterozygous) recessives.

For example, a snow bred to an albino will produce all albinos that are heterozygous snow. Additionally, snow bred to albino het axanthic will produce on average 50% snows and 50% albinos het axanthic. Or, you could breed snow to het albino, and any albinos you get would also be het axanthic.