Your duckling will look like a Rouen, as others have said. It will never turn white.
White ducks have other colours 'beneath' the white - ie the white is masking the effect of all offer colour genes. So you never know what you'll get when you cross a white duck to another duck.
White ducks have other colours 'beneath' the white - ie the white is masking the effect of all offer colour genes. So you never know what you'll get when you cross a white duck to another duck.