In an earlier post I mentioned finding large D-ring binders at a discount outlet.
Today I used my DIY watercolor paper pad and made several color swatches of my water soluble media. These will be three-hole punched and go into one of these inexpensive binders. I will have one binder with only color charts from all my media.
In one place, easily accessed for comparison or additions.
So far I have made 5 charts from different media.