elementYellow ochreElements · Colors & materialsA yellow iron-earth pigment. Not red ochre, and not gold as metal.Yellow ochre is used in Medicine.Pliny’s Natural History treats yellow ochre among earth pigments and related preparations. A Roman-era pharmacological and craft use of yellow iron-earth, not red ochre and not gold.from Pliny the Elder · Natural History, c. 77 CEused in · sourced · documentedsourcesNatural History · Pliny the ElderPliny, Naturalis Historia.