Because no artificial food coloring is used in production process, the product may differ in colors depending on its raw material(Pollak). There is no problem with the quality and you can feed it to your pets at ease. If you have trouble checking if the product is defective product or not, please contact your local distributor or our head office at main phone number (+82-31-906-7325-ext. 2). Also there could be a defect or pinhole in product during distribution process. In this case, please contact your local distributor or our head office for immediate exchange. * The image above is for your reference to show both Fuco-Pollak and Relief Green-Tea Pollak. These products in normal condition do not differ in their colors and please refer to the image for color comparison only.