That cannot be seen with the eye. Great piece for experienced collector. These pieces can also be seen at Rijksmuseum, Boymans van Beuningen and museum of Den Haag. The item "Rare Rozenburg eggshell vase Holland Art Nouveau purple Thistles Sam Schellink" is in sale since Thursday, August 2, 2018.This item is in the category "Pottery & Glass\Pottery & China\Art Pottery\Gouda". The seller is "dutchartcollecter" and is located in Gasselte. This item can be shipped worldwide.