There are two white genes: dominant (I-locus) and recessive (c-locus). Neither of these are sex-linked genes. Different breeds are known for carrying one or the other; however an individual bird may vary from what is typical for the breed.
If the breed generally carries dominant white, it is unreliable in creating a sex-link bird because the, offspring who receive a copy of I will be at least partially white, regardless of gender. You won't be able to tell the difference between the birds who are white as a result of I versus those who are white (silver) due to S.
The silver/gold gene is sexlinked: males have two copies of the gene; females only one. Breeding a silver female to a gold male will produce sex-linked birds. Note that the male must be homozygous for gold or it won't work.