The Francke "tina" process is based on the same metallurgical principles as the system described by Alonzo Barba in 1640, and also on those introduced into the States in more recent times under the name of the Washoe process.

Betancourt, who begun the conquest of the Canaries, was slain in a war with the natives, leaving one Menante his heir; who afterwards sold the islands to one Peter Barba of Seville.