All you need is a mixture of baking powder and water. However, I wanted some “color” in my aging, and so used some turquoise and green and white paints to achieve the exact look. I didn’t measure anything, but it was just a mixture of all these elements until I thought it was just right.
Tip: used a piece of stiff cardboard to rub off some of the paint and baking soda to create texture.
What do you think? Success?