Difference in the Bark
Summer bark peels readily, is smooth inside, of a yellow color, which turns reddish upon exposure to the sun, and is chalky-gray in very old canoes. Winter bark adheres closely, and forcibly brings up part of the inner bark, which on exposure turns dark red. This rough surface may be moistened and scraped away. All winter-bark canoes must be thus scraped and made smooth. Sometimes the dark red is left in the form of a decorative pattern extending around the upper edge of the canoe, the rest of the surface being scraped smooth.