It's no secret! I used Tyler Hobbs' method which has a great write up here: https://www.tylerxhobbs.com/words/a-guide-to-simulating-watercolor-paint-with-gener

It's no secret! I used Tyler Hobbs' method which has a great write up here: https://www.tylerxhobbs.com/words/a-guide-to-simulating-watercolor-paint-with-generative-art https://www.tylerxhobbs.com/words/a-guide-to-simulating-wate... Then I tweaked it until it look good for use in my app.