The padre Cogolludo says, that on the memorable occasion when his sight failed as he was going down the steps of the great Teocalis, he found in one of the apartments, or, as he calls it one of the chapels, offerings of cacao and marks of copal, used by the Indians as incense, burned there but a short time before; an evidence, he says, of some superstition or idolatry recently committed by the Indians of that place.
"Incidents of Travel in Yucatan, Vol. I."
John L. Stephens
Unfortunately, I habitually used copal varnish as a medium.
"The Autobiography of a Journalist, Volume I"
William James Stillman
Of his gum copal he gave me a specimen.
"The History of the Rise, Progress and Accomplishment of the Abolition of the African Slave Trade by the British Parliament (1808), Vol. I"
Thomas Clarkson