Quick Answer
The best colors of birch bark for making goggles are those with a high reflection coefficient, particularly the white and light-colored varieties, such as the white paper-like bark of paper birch and the light-yellow to white bark of river birch.
Selecting Suitable Birch Bark
When selecting birch bark for making goggles, look for the whitest and lightest-colored varieties. The white paper-like bark of paper birch (Betula papyrifera) is particularly suitable due to its high reflection coefficient. River birch (Betula nana) and yellow birch (Betula alleghaniensis) also produce light-colored bark, but it’s not as reflective as paper birch.
Preparing the Birch Bark for Goggles
To prepare the birch bark for making goggles, start by collecting and drying the bark. Remove any loose or damaged pieces, and cut the remaining bark into the desired shape for the goggles. Use a sharp knife to trim the edges and smooth out any rough spots. For maximum protection, the birch bark should be as thin as possible, ideally less than 0.5 mm thick.
Assembling the Goggles
Once you have your birch bark in the desired shape, assemble the goggles by gluing the pieces together with a waterproof adhesive. Apply a thin layer of the adhesive to the back of the birch bark and attach it to a wire or plastic frame. Make sure the birch bark is securely attached and the goggles seal properly around the eyes.
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