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Fig. 01

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Fig. 01

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  1. Fig. 01

  2. +II +II +III +III reducing reducing + + + + Mn Mn , , Mn Mn Na Na ,K ,K , ... , ... treatment treatment oxidation oxidation leaching leaching O O , H , H O O 2 2 2 2 ? ? Mn Mn 2+ 2+ leached glass leached glass original glass original glass inter inter - - lamellar void lamellar void ? ? MnO MnO precipitates precipitates 2 2 white, opaque white, opaque white, opaque iridescent, opaque iridescent, opaque iridescent, opaque brown brown brown - - yellowish yellowish yellowish uncorroded uncorroded , clear , clear (a) months, months, (b) months, months, (c) hours, hours, (d) years years years years days days Fig. 02

  3. Fig. 03

  4. a b Fig. 04

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  6. Transversal plane Longitudinal plane 1 Longitudinal plane 2 Longitudinal plane 3 0 min 180 min 270 min Fig. 06

  7. a b to glass surface Fig. 07

  8. 0 min 180 min 270 min Fig. 08

  9. 0 min 180 min 270 min Fig. 09

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