In the event a mistake is made. Please notify me to make arrangements to have the situation rectified. Because of the nature of the product pigment separation can occur please roll the bottle to redistribute pigment before use. Some staining my occur please read product descriptions for warnings of known stainers. And fading of pigments can happen. if you notice this please let me know ASAP. I do test but cannot guarantee beyond a 6 month from purchase time frame. In the case of thermals and photochromatic pigments these have a known shelf life that varies on how the product is stored and handled. Please keep out of direct sunlight and heat/cold to extend this shelf life.