The tanning solutions have a 6-month shelf-life symbol on their labels but they can last up to 2 years! Opened or unopened, the "cosmetic bronzer" (or FD&C colors) in tanning solution starts to oxidize between 6-9 months. (This is part of the natural aging process of tanning solution.) The cosmetic bronzer is comprised of FD&C colors, and when FD&C colors start to oxidize their coloring shifts. Fortunately, the tanning solution isn’t "bad" or cannot be used when the cosmetic bronzer shifts! When the coloring shifts, the Bali Bronzer Drops (cosmetic bronzer additive) can be added to help restore any brown-tones that have shifted from the oxidization process.
DHA (Dihydroxyacetone) is the active ingredient that creates a lasting (7-10 day) browning effect on the skin. DHA is a clear (colorless) ingredient and can last 2 years from purchase. Since DHA is a clear ingredient, the FD&C colors (cosmetic bronzer) are added to the tanning solution so you can see how you’re applying the spray tan onto the skin. At about 6 months the cosmetic bronzer will start to oxidize exhibiting an olive undertone overtime. The cosmetic bronzer rinses off in the first shower, so it is unable to leave any lasting olive hues on the skin.