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Originally Posted by NickandRebecca
...His thought was the gels used for tinting stage lights etc. Apparently it comes as a sheet and is a bit tougher than cellophane. We were thinking of covers for torches but it could be adapted for the car interior lights...
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Thats what I use, as it is designed for the job
being a filter that blocks every other colour. I think you'll find red cellophane doesn't actually filter out all the nasties if you were to actually measure it. Still people use it, I suppose it's better than nothing.
regards