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07317126649Kevidite Patent blue V Food Color is frequently used. In oncological surgery, patent blue V dye is increasingly utilised to locate sentinel lymph nodes in breast cancer and other malignancies. It has a violet powder look and comes in a variety of hues depending on the pH value of the medium. Kevidite Patent blue V Food Color is used in medicine as a dye in lymphangiography and sentinel node biopsies to colour lymph vessels so that they can be injected with X-ray contrast media.