Start here:http://www.rosco.com/us/filters/roscolux.asp Or, go to your local college theatre department and ask if they have any gel scraps you can have. Congo Blue is Roscolux #59.
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my guess is you're making the infrared filter glasses - The easiest way to get it is to order a sample pack from the manufacturer. search 'gel sample' etc... Otherwise, making it is a pretty in-depth process involving making the mylar sheet, mixing the dye, and evenly applying it, drying and cutting it... easier in a hundred ways to buy it.