It’s really hard to compare watercolor paper on price vs quality. For one thing, the quality is highly subjective. While some factors make watercolor paper more likely to work well with water and to be pleasurable to use (weight, cotton content, sizing), you can’t guarantee that you’ll like a paper or that it will work with your style until you try it out.
It’s even difficult to compare on the basics of how much is costs, since every paper comes in a variety of different sizes and price points. How does $30 for 20 sheets of 9×12 really compare to $20 for 12 sheets of 8×10? It’s a math problem and also a pragmatic problem (which size do I prefer to paint on, or can I more easily cut to a size I prefer to paint on?)
Well: I’ve at least attempted to solve the math part by making a spreadsheet.
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