Unusual purple Delft tile of two swans swimming perhaps through the brush through the Maasland near Delft on a cloudy but simultaneously sunny Dutch day. The purple glaze is made with the mineral Manganese. Manganese dioxide, a.k.a. glassmaker's soap, makes glass clear by reducing green, it strengthens steel, and in current events, Potassium permanganate, KMnO4 is ultraviolet - also Pantone's Color of The Year for 2018. Certainly this tile was much more vivid in the 19th Century than now. Image is in a circle. Flowers in each corner. Chipped in the top left corner. Minor chip in bottom right corner. Dimensions are 5 x 5 x 1/4 inches. From the Netherlands, mid 19th century.