I get that part. What confuses me is that it appears that the watercolor was brushed on but within the same stroke u see multiple colors. Like the orange and blue and perfectly broken by the white background. How is it that the color transition is so continuous? As if the white has wax on it. Do you follow my question?
The multiple colors look was done but puting colors wet on wet. This allowed them to mix. Still the white spaces are just paper as I mentioned. No masking tape. No wax no nothing. I stoped the brish around places I wanted to stay white. Thats it