from Education.com

How to use Colored Filters to Send Secret Messages

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from Poshmark

Instant photo series color filters

Instant photo series color filters Four different color filters / orange, blue, green, red. Urban Outfitters Other

Love the unique grey-ish hue here. wondering if this is done post processing or is there some sort of filter applied when photo is taking? Might be interested to play w/color hue on a photo or two.

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3
from GAIN EXPRESS

GX-301+ Gooseneck Fiber Optic Microscope Illuminator +Color Filters

Power supply : or (Universal Type)Color Filters : White (not very white), Blue, Red, Yellow and GreenLamp Model : Temperature :...

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