Https://www.lybrary.com/paint-brush-colo......056.html walter cummings was a fixture at conventions in the early '70's.a swell fellow,he shared with anyone who asked him.this color change was his masterpiece.dont expect to learn it over the long weekend.it will take time but is well worth the effort.he could repeat it numerous times,always flawless.enjoy learning it and give a silent thanks to a real artist...

Very nice effect. Thank you.