This section is from the book "Spons' Mechanics' Own Book: A Manual For Handicraftsmen And Amateurs", by Edward Spon. Also available from Amazon: Spons' Mechanics' Own Book.
"Chrome orange" is a lead chromate, brighter than vermilion, but less durable. " Orange ochre " is a bright yellow ochre burnt to give it warmth of tint; dries and works well in water and oil, and is very durable; known also as " Spanish ochre." " Orange red " is produced by a further oxidation than is required for red-lead; is a brighter and better pigment.