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While sunlight enables plants to grow, exposure to sun after a plant's maturity accelerates the molecular decaying process. UV 420 Jars block all UV-B rays and the complete spectrum of visible light (with the exception of violet). At the same time, they allow permeation of UV-A and infrared light. This unique combination offers optimal protection against the aging process, thus lengthening the lifespan and potency of your daffodils or crushed oregano or whatever kids are putting in jars these days.