Reusable magic paper with water 22x28.5 cm, for exercises with the brush

N. 1 sheet of reusable, slow-drying magic paper, applied on black cardboard. Ideal for studying the stroke of brushes, for exercising and for ideograms. Measures 22x 28.5 cm.
To be used only with water; with the drying process, the line disappears, for countless uses.