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Where do the greyish shadows on the holmium oxide filter come from? Do they affect the measurement?

April 26, 2017affect filter greyish holmium measurement oxide Shadows

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Where do the greyish shadows on the holmium oxide filter come from? Do they affect the measurement?

1 Answer

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The holmium oxide glass is slightly hygroscopic, so the covering is a kind of water film. Measurements are not affected. The filter may be wiped with alcohol and a soft tissue to remove the film. As a basic principle the filters should be stored in a dry place.