I have been stenciling bread for several years, and I use a small brush to paint the stencil openings with a thin egg wash before dusting with flour or cocoa powder. If doing several loaves with the same stencil, I do need to wipe the stencil clean every few usages. The egg wash holds the stencil beautifully, for wrapping and gifting or freezing. For the mylar, I use overhead transparencies that are available in office-supply stores. I'm a seminar instructor and I have a big supply of these left from the era when we used overhead projectors instead of LCD projectors, but I'm pretty sure the product is still available. One advantage of using the transparencies is that you can feed them into a printer or photocopier (buy the type meant for your type of printer) to transfer designs on the transparencies.

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