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Bill it isn’t safe and should be put in the bin.
Being dark brown implies the filter material is a dye - which absorbs light in the visible spectrum but almost certainly allows infrared and UV to pass through. You won’t feel a thing but exposure to the sun through this is going to damage your retina.
The only safe solar filters are metallic film types that look like a mirror - these refkect the uvan infrared as well as the visual light. Even 2 layers of aluminised Mylar do ok.
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