horn is a remarkable material and can be quite thin. Colonial hornbooks, were paddle shaped pieces of wood with a piece of paper on which the alphabet or some other commonly referred to lesson was printed and then covered with s thin sheet of horn to protect the paper. thin pieces of horn were used in place of glass in lanterns Horn can be translucent to see the powder without being dangerously thin, especially depending on the type of horn. Many cattle today are "polled" ie do not grow horns pr are dehorned, having the horn buds burned soon after birth. . Most cattle in colonial days were permitted to grow their horns and long horns helped hold the yoke on oxen. Horn was a commodity then far more valuable than today. Buttons, spoons, powder horns and thin pieces as substitutes for glass, other containers,