D. melanogaster: brown male mutant x white female mutant,F2 proportion? phenotype double recessive zygote?

Hi. What is the proportion of the cross above? What should i expect to see in a double recessive zygote, carrying both mutant alleles of brown and white genes? my guess is white, as it codes enzymes that work at the end of this metabolic pathway. But some people are saying brown, & a few believe its gonna be scarlet. Any thoughts? Thanks