How is Delft Blue handpainted?

At The Original Blue the decoration on the Royal Delft products are fully painted by hand. The decoration process starts with the creation of the outline after which the Delftware painters carefully fill in the details by hand using special paintbrushes made or marten and squirrel hair. The paint is water based and color shades are created by adding more, or less, water to the paint. The Delft Blue scenery is painted with a color mixture made to a centuries-old recipe consisting mostly of cobalt oxide. Due to a chemical reaction during the firing process, the design painted in black, hidden below the glaze, turns blue. The hand-painted products are to be recognized by the Royal Delft trademark.