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Part two on preparing a wood panel for painting with the application of chalk grounds and the sixth in our technical series on painting icons, this article discusses preparing the glue solution used in the preparation of wood panels for tempera painting—size, pavoloka, and gesso—since the earliest Christian period until today. While the series specifically apply to making icon boards and preparing them for painting egg tempera icons, it has application to preparing wood panels for painting in any medium on chalk grounds...