Probably because of the greater of titanium oxide during heating. For example, the colors are more opaque. Film timer is titanium dioxide , but the examples of hot air for 20 minutes onwards. There is a shining above example does not over heat , possibly because the longer the particles cause agglutination greater cause unevenness of particle film (from SEM), the gap between particle film. or an area where a lot of glass base. Therefore, the light transmittance of light of blowing hot air at 5 minutes (from SEM) is the time. The particles are dispersed at best. A more uniform The observations of the area where the glass has less volume. Probably due to the oxide, the lowest value shines through.
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