Rare and Mint, Bing & Grondahl, Denmark, Signed Porcelain Glaze Sample Plate. 1950sI splurged on this one, but I fell in love with it, and a glaze sample plate is a very rare thing to find this one 1950s, Bing and Grondahl, Denmark, and signed on the back by the glaze tester, to boot. For the lover of color, or Denmark, or mid century ceramics, or ideally all three. A special thing. 6 3 4" in diameter and in mint condition, bright white porcelain, super clean and completely perfect.