How a chelsea filter works: it leaves only certain wavelentgth of red yellow and green go through

How to use a chelsea filter with transparent and and opage gems. Use only white light

Chelsea

Polariscope

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Chelsea filter

Conoscope

Magnetism

Dichroscope

$Refractometer$

and the video here:

Other tools

Lab tools

How a chelsea filter works

How to use a chelsea filter

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