Dear fellow stations, please note the following when printing your QSL cards:
When printing 250g copper-plated cards with one side dark and the other light, it's easy for the two sides to stick together. Specifically, the white side will have the color of the back pattern printed on it, and the edges will also be stained with the color of the back pattern.
If possible, I recommend replacing the white card with a white slip or covering it with a protective film and writing on it with a marker.
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