When, by repeating the process, most of the Pb is eliminated, the rest is oxidized by heating in the air.
"An Introduction to Chemical Science"
R.P. Williams
Moreover, iron implements have been found at the bottom, of modern shapes and very little oxidized.
"Impressions of South Africa"
James Bryce
A bluish or blue mucous membrane indicates that the blood is imperfectly oxidized and contains an excess of carbon dioxid, and is seen in serious diseases of the respiratory tract, such as pneumonia, and in heart failure.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler