Per this link: https://www.sciencedirect.com/science/article/abs/pii/S0141813020343622

"Due to its excellent film-forming ability, non-toxicity, biodegradability, and low cost, CMC has aroused great interest as an edible and biodegradable film material for food packaging [11,12]. Numerous studies have been shown that CMC film exhibited good transparency and effective oxygen, carbon dioxide barrier properties [12]. However, CMC film has rather inferior mechanical and water vapor barrier properties, which restricts its potential application in the food packaging field ".

I think a lot of these properties are great for alternative photography.

**Excellent film forming.
**Low cost.
**Oxygen inhibition.
**Water permeable.