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This scratch knife is for use with Claybord panels, especially the black Clayboard. Black Clayboard is more commonly known as scratchboard. The scratch knife for Clayboard is used to make scratches in the black surface to reveal the white color underneath. The scratch knife is great for creating details and hatch marks. Add one to your art supplies whether you enjoy scratchboard or not, you never know how something new in your art supply can come in handy
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