The CrystalGuard Envelopes, specifically the Size #4 glassine variant, offer an ideal storage solution for Plate Number Blocks and covers collections for stamp enthusiasts. Made from semi-transparent #30 glassine, these envelopes are ACID FREE and measure 2 5/16" x 3 5/8". Additionally, these envelopes are commonly used by the U. S. Post Office for stamps bought at postal counters. Glassines are versatile, also suitable for storing negatives, plates from electron microscopes, seeds, and etymology specimens. When using these envelopes, it's recommended to write Scott Numbers and identifying information before placing stamps inside to avoid impressions on the stamps.
The Size #4 glassine is ideal for storage of Plate Number Blocks and Larger glassine envelopes can be used to hold your covers collection. 100 - Glassine Envelope #2 - ACID FREE. made from semi-transparent #30 glassine.
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