As far as i am aware (and the english kennel club) labs only come in three colours Black, Brown and Golden (Yellow). That aside colour genetics is not straight forward. White is the least dominant colour so both his parents must have been very pale yellow (if they were white he would be white). If we work on the idea that they were all yellow in various shades then he is pure for yellow. Cross yellow female is less straight forward you would need to know what breed both her parents were. So in short is is not possible to answer your question with the information available. Lets nature take its course and enjoy the experience.
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