Painting in gouache over a yellow casein layer puts "fire in the belly" of a gray painting.
From my Gumroad tutorial Triads: Painting with Three Colors: https://gumroad.com/l/color2

CASEIN UNDERPAINTING
Richeson casein: https://amzn.to/2L02U6R
GOUACHE TOP LAYERS:
Yellow ochre: https://amzn.to/2XYzvSB
Prussian blue: https://amzn.to/3iCahPd
Light red: https://amzn.to/36JIcTM
Titanium white: https://amzn.to/2XSOld4

MATERIALS:
Watercolor sketchbook: https://amzn.to/2L989y2
Travel brush set: https://amzn.to/2xwq1Rr
Water cup: https://amzn.to/2soTw2L
Homemade easel: https://sellfy.com/p/LnZ8/
Tripod: https://amzn.to/2xrRaFc
Water-soluble colored pencils set: https://amzn.to/2DKmT5o

WATER MEDIA PAINT SETS
• M. Graham gouache primary set: https://amzn.to/2Zwd6rt
• Winsor & Newton gouache primary set: https://amzn.to/2JiDMbo
• Holbein gouache set: https://amzn.to/2KW4s1j
• Royal Talens gouache set (8 colors): https://amzn.to/2MGftGf
• Shinhan Pass watercolor/gouache hybrid set: https://amzn.to/2xw7EvV
• Caran d'Ache pan gouache set: https://amzn.to/2PfQTxX
• Holbein Acryla Gouache (matte acrylic): https://amzn.to/2L0g3MT

OTHER MATERIALS
Pentalic watercolor sketchbook: https://amzn.to/2L989y2
Richeson travel brush set: https://amzn.to/2xwq1Rr
Richeson “Grey Matters” brush set: https://amzn.to/2YeNO0P
Water cup: https://amzn.to/2soTw2L
Homemade easel: https://sellfy.com/p/LnZ8/
Tripod: https://amzn.to/2xrRaFc

BLOG POSTS WITH MORE GEAR INFO:
Gouache Materials List: http://gurneyjourney.blogspot.com/2016/07/gouache-materials-list.html
Watercolor Materials: http://gurneyjourney.blogspot.com/2014/08/watercolor-in-wild-materials.html

BOOKS BY JAMES GURNEY:
Color and Light: A Guide for Realist Painters: https://amzn.to/2JhWtfc
Imaginative Realism: How to Paint What Doesn’t Exist: https://amzn.to/2LbVHhc
Dinotopia: A Land Apart from Time: https://amzn.to/2xyamRM

VIDEO TUTORIALS:
“Watercolor in the Wild” https://gumroad.com/l/watercolor
"Gouache in the Wild" https://gumroad.com/l/gouache
“Casein Painting in the Wild” https://gumroad.com/l/casein
"Gouache in the Wild" (DVD): http://kunaki.com/Sales.asp?PID=PX004NVKHN
“How to Make a Sketch Easel” (DVD): http://kunaki.com/Sales.asp?PID=PX00Z4M3XY
Animal Painting vid: https://gumroad.com/l/paintinganimals
Casein in the Wild: https://gumroad.com/l/casein

OTHER OFFICIAL SITES
Instagram: https://www.instagram.com/jamesgurneyart/
Pinterest: https://www.pinterest.com/GurneyJourney/
GurneyJourney Blog: http://gurneyjourney.blogspot.com/
JamesGurney Website: http://jamesgurney.com/site/shop
Facebook group "Sketch Easel Builders": https://www.facebook.com/groups/403006076777641/?source_id=121255121263267

“LIVING SKETCHBOOK” APP
Experience one of James Gurney's sketchbooks on your smartphone or tablet.
For iOS at iTunes: https://itunes.apple.com/us/app/living-sketchbook-vol-1-boyhood-home/id1209783393?ls=1&mt=8
For Android at Google Play: https://play.google.com/store/apps/details?id=com.livingsketchbook1

CAMERAS and AUDIO:
Canon M6 (time lapse, video, and stills): https://amzn.to/2J4RTgX
Canon PowerShot Elph (point-and-shoot): https://amzn.to/2Ji1Vid
Zoom H2N digital audio recorder: https://amzn.to/2XXAOfP
Rode Video Mic GO (microphone): https://amzn.to/2UQGTc9

Music by Kevin MacLeod

Thanks for ordering through my links. Any Amazon order you place through any of my links will give me a small royalty, at no extra cost to you, and that helps support my work.