It's hard to say with 100% certainty what the double homozygous (amel x clark) albinos would turn out like. Logic would dictate this though, the lavender and purple are expressions of an amino acid (be it tyrosine or another protein), the amel strain makes that protein NON-functional, on that particular gene locus. If you add a non-functional gene in its homozygous form to the functional gene in its homozygous form, the protein would be non-functional.
Thus you would theoretically only produce white phase babies, and the amel, white clark strain and double homozygous could easily be mistaken for one another creating a slew of potential problems for retic breeders.
take care,
Jordan