http://www.thenakedscientists.com/HTML/content/kitchenscience/exp/make-an-infra-red-camera/
In this article here it says I need a totally black exposed negative.
How exactly do I produce one of those?
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In this article here it says I need a totally black exposed negative.
How exactly do I produce one of those?
If you load a roll of film into a camera, the leader will be fully exposed and will be black upon developing. You can pull a bit extra out of the roll. Or in sunlight you can take a few shots at the longest exposure time (or in bulb mode for say 30 secs) and that should produce black.
Or if you don't have a film camera, just pull a length of film out in bright light for a few seconds, then have it developed. Or ask at a print shop if they can give you the exposed ends of a roll they've trimmed off after processing.