Traditionally, bamboo was the best material available for making blowguns. It is naturally hollow, fairly even along the whole length and airtight. Compared to more modern materials such as PVC pipes, however, bamboo has a major drawback.
It is segmented, and the segments have to be poked out in order to make a blowgun. Find a piece of dry bamboo which is about ½ inch in internal diameter at its narrowest and has no cracks. It should be between 4 and 7 feet in length.
The longer it is, the faster the darts will shoot. Get an iron rod at least a foot longer than half the length of your bamboo and narrow enough to fit through it. A thin piece of rebar will work well.
Thrust the rod into the bamboo to break through the first node. Keep going until you have broken through all of the nodes. You will still have a narrow rim where each node was.
Put on protective gloves such as oven mitts. Heat the tip of the iron rod over a flame until it glows red hot. A wood fire will do in a pinch, but ... more.
A pen drying out can be a frustrating experience, particularly if you don't have another pen handy to continue your writing. Fortunately, a dried-up ballpoint pen isn't without its uses. If you have a ballpoint, hollow tubed pen that runs out of ink, don't throw it out; instead you can turn it into a blowgun in just a few minutes with no additional tools.
Pinch the pen between your thumb and index fingers about 1/2 inch below the non-writing tip until the rear cap is loose. Spin the pen slightly after each pinch to ensure pressure around the entirety of the cap. Remove the rear cap.
Pinch the pen between your thumb and index fingers about 1/2 inch above the writing tip until the narrowed point is loose. Spin the pen slightly after each pinch to ensure pressure around the entirety of the tip. Remove the narrowed point and ink cartridge.
Load the pen with the projectile of your choice. Two good choices are cotton swabs broken in half or balls of paper. Place the end of the tube with ... more.
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