Step 2: Send us your target for processing. A target must be at least .33 fluid ounces of a perfume, cologne, or fragrance oil that is freshly batched. To achieve the best possible results, samples should be as freshly made as possible. Chemicals change and evaporate over time, so an older target will not neccesarily duplicate well. While the GCMS may read out the correct materials contained in the target sample, a fresh batch may smell different than an older target which will have matured and changed over time.