Abstract: A laminate includes a backing of generally flexible, transparent sheet material supporting a particular layer of encapsulated liquid crystal material having properties for providing color variations in response to slight variations in temperature. A mixture of adhesive and ink is provided and disposed on the particular layer in a preferred method of making the laminate. The laminate is particularly useful in locating veins prior to the taking of a blood sample or prior to an invasive process of inserting fluids into a patient. The laminate can be adhered to the skin and the non-visible temperature pattern of the skin, including the generally hotter areas associated with the veins, will provide the liquid crystal material with a corresponding visual color pattern. The pattern will include a stripe of color indicating the location of the vein to facilitate the taking of the blood sample from the vein or the insertion of fluid into the vein by an invasive process.