I was studying at uni recently and as I looked out the window I noticed the bottom window was normal but the window above had a filter that made the sky appear pink/purple so I wanted to recreate something to that effect but with much more interesting scenery.
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Air Filter are Developed for gas mask use only I Global LAV (813)602-1748
A good astronomer wants to use his telescope at night AND day. For this you need a high quality solar filter. Sunspots, eclipses and transiting satellites, all can be seen clearly and safely when using a black polymer filter. 55 more words