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Includes 1- 50 ml / 1.7 oz Black Ultraviolet Glass Heavy Wall Jar with Airtight Lined Lid, 1- spatula, and 1- Silver Label for each Jar. Our Violet glass products blocks the complete spectrum of visible light with the exception of the violet part. At the same time it allows a certain part to be permeable for radiation in the spectral range of UV-A, and infra red light. This unique combination offers optimal protection against the ageing processes that are released by visible light, thus lengthening durability and potency of products.