From the skin of plants such as milkweed, dogbane and nettle the Illiniwek obtained strong fibers
which they twisted into cordage. This was used to manufacture items such as fishing nets and
lines or woven into belts, bags and clothing. The inner bark of the wi-ka-pi or basswood
(sometimes called Linn) tree was the most important source of bast fiber from which the storage
bags were woven. The most common bags (of basswood innerbark fiber and cordage) in the Woodlands,
utilized primarily for storage of dried corn, beans, squash and seeds.
Mats for covering winter house frames were sewn using wi-ka-pi string and a needle made of buffalo rib, from cattail leaves which were gathered in the swamps or river shallows in the late summer. These made a windproof, waterproof wall. Mats for sleeping and sitting on inside the houses were woven, using wi-ka-pi string, from bulrushes. These were woven in bright plaids, using natural dyes such as dock root, blood root, nut hulls (especially black walnut), tree barks, berries, copper, etc. Baskets were also patterned with colors.
The Illiniwek made wide use of the many varieties of trees that grew in their country. From the great cottonwood and cypress trees they made the 40-foot dugout canoes or Missouri so important to their economy. With fire they felled the tree and with fire they would hollow it out, charring the inner or outer surfaces and scraping off the coals with shells or copper tools
The burls or knots that are sometimes found growing on tree trunks were carefully split off and then, with burning and scraping, shaped Into bowls or feast spoons. The finished objects were then smoothed and polished and admired for the beauty of the wood-grain patterns.
Tree-trunk mortars and pestles for cracking and grinding corn were also widely used, made in the same manner of burning and scraping.
Illiniwek potters made a variety of cooking and storage vessels, some of them were quite large. The outer surfaces were sometimes textured by use of a stick wrapped with wi-ka-pi (basswood inner bark) cordage. This tool was rolled over the damp pot which gave the clay surface somewhat the appearance of a coarse textile. Some pots were decorated around the rim with incised or engraved patterns but these tended to be more plain than those found further south or to the north. The potters used wooden paddles, bone and shell tools, as well as the cord-wrapped sticks, for forming and decorating
FLINT or CHERT
The Lower Illinois Valley is famous for the light colored chert that occurs in the limestone. (Flint forms as nodules in chalk, usually in Europe.) Knives were, of course, necessary for the preparation of food and fibers. Projectile points and scrapers were important for hunting and the processing of hides.
Cobble stones of igneous rock (usually granite) brought down by glaciers of the Ice Age. were used as hammers to reduce large pieces of chert to a manageable size. Various tools made from heavy sections of elk antler were used to thin and further shape the chert flakes while deer antler tines or copper pressure-flakers were used to give the final form.
The time periods and cultural preferences determine the exact shape of the point while the resources available determine the material from which it is made. Once the technique is learned, a point can be made in less than five minutes.