CMC Cyanotyoe
Today I've sort of discovered that you can definitely use CMC almost by itself to make cyanotypes.
Here's the formula. Let's call it the AMO20250303 formula, which is all I ask that you do for me for teaching you this formula. Mention it by this name in other forums and try it out!
Following the Habib Saidane mixture ratios:
*1g CMC (very thick substance).
*1ml water (or more to thin it down).
*0.3g zodium benzoate (may not play a role).
*0.25g sulfamic acid (adding this will make it a thick white foam immediately after adding it).
*1 dropper of mike wares New Cyanotype formula...a few drops Basically.
exposure:10sec under a strong uv LED COB, or 15 minutes under a projector. Spray 0.3% peroxide. The peroxide starts the Fenton reaction to polymerize and also instantly oxidizes the cyanotype. Then just wash it in increasingly warmer water until all extra blue and yellow has cleared.
The attached photo gives you an idea of the resolution achievable. I expose using a 3000L DLP projector at 1080P so the image's resolution is not too much better than that.
I'm performing tests today by removing each chemical. Do you need the acid? heck yeah you do if you want deep blues. Do you need the Sodium Benzoate?-> Somehow this make the image clear to paper white removing all/most blue staining. I don't understand how it does it but yeah you need it. It also removes brush strokes apparently, again, I don't know how. 1ml of water? well we are starting from the 2% solution that Habib Saidane recommended, that stuff is thick like frozen honey, so you need some watering down until the stuff doesn't feel too thick.