 Potentially allergenic proteins (peanut, soy, dairy, wheat) may be combined with shellac.The primary reasons for waxing are to prevent water loss (making up for the removal in washing of the natural waxes in fruits that have them, particularly citrus but also, for example, apples) and thus retard shrinkage and spoilage, and to improve appearance.Dyes may be added to further enhance appearance, and sometimes fungicides.