For example White Leghorn
Quote:Silverudd (1974, p. 194)
http://onlinelibrary.wiley.com/doi/10.1111/j.1601-5223.1974.tb00931.x/pdf
The combination of gold and inhibitor of gold reduces/removes the problem of straw tinge in white birds - similar to silver.
In general You need only two or...
Another alternative source for the recessive White could be the Barred Plymouth Rocks, which were used to create the Gold Legbars. So - not easy to trace it back definitely, where the recessive White originates from.