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Brian, does your camera have an IR filter on it? If so, then you might consider either removing it or using a different camera.
If your photos are turning out purple, then try an IR pass filter. Note, IR pass, not IR block. An IR pass filter blocks everything except the red end of the spectrum. A red filter may work as well. I've seen some very crisp images taken with a full aperture Baader AstroSolar film filter and an IR pass filter.
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