Finally, there may be a reddish tinge or sediment when madder or logwood has been eaten.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
Some authors recommend Sibukao as a substitute for logwood.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera
It was a good logwood country, and here he had erected machinery for extracting the dye.
"Incidents of Travel in Yucatan, Vol. I."
John L. Stephens