Here are 2 collodions I mixed up in the last week. The red one on the left used old USP collodion that was about 1 1/2 years old. The yellow one on the right is from fresh USP collodion. I know the yellow will work great, not sure on the read. Possibly more contrasty and definitely slower in speed.
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| Red old USP Collodion, Yellow new USP Collodion |
