The first thing you need to know is that it's best that you use a natural fiber. The Procion dyes work great on the old linen and cotton napkins and fabrics.
I soaked my napkins in a mixture of 1 cup of soda ash to
1 gallon of water and for about an hour.... well... that's how long YOU can soak them. I believe I got sidetracked with something else!! I then removed them from the soda ash and LIGHTLY squeezed out most of the water.
I placed 6 of these napkins in each of 2 baskets.
Next, I needed to find a place for the ice and dye to drain. You can use a plastic tub underneath or drain it in a utility sink by putting something under the basket to raise it, allowing room for drainage. What's nice about this process is that you can "make do" with whatever your particular circumstances are. - I then completely covered the napkins with ice.
The next step was to sprinkle dye on the ice. This was a practice thing because it has been trial and error for me to figure out how much dye to use and what colors will be created after the ice has melted! I mainly used 3 primary colors of Turquoise, Fuschia and Lemon Yellow and then put on another layer of ice. Then I waited... and waited... and peeked... and waited some more! SURPRISE!!