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VISTA envelopes are high-quality PAT-tested glassine envelopes made of satinised, semi-transparent window and photo glassine, manufactured from 100% pure, unbuffered cellulose (pH value approx. 6.5), free of chlorine, acids, lignin (kappa number < 2), metals and plasticisers. The air permeability of glassine offers advantages over plastic packaging, especially in case of possible climate fluctuations.