UV light passes through thick glass and causes fluorescence in diamonds indoors.

Описание к видео UV light passes through thick glass and causes fluorescence in diamonds indoors.

To dispel the argument that UV light that causes color whitening in blue fluorescent diamonds does not pass through windows. This bathroom door is 10mm thick or 0.4 inches!
The center diamond is GIA Medium Blue. Clearly the diamonds are fluorescing.
What is more, the long wave frequency used for grading fluorescence has around half the effect as these simple cheap torches which work in the near visible range. It is for this reason that earlier tests (with the wrong light meters) are totally irrelevant.
This simple test shows that very long wave UV that is in the just or near visible range does pass through windows.

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