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<p>[QUOTE=&quot;charlie cheswick, post: 2966683, member: 853&quot;]From what I&#039;ve been reading it&#039;s got thickness on its side for being at least pre 20th century by measuring 0.4 inches thick</p><p><br /></p><p>&quot;In order to avoid cracking in the baking process due to the impure clay containing salts etc., early Delft Tiles were 0.6 to 0.7 inches thick. As a result of purification of material clay and addition of calcium elements tiles became less fragile so its size became 0.4 to 0.5 inches in mid 17th century. After 19th century thickness becomes less than 0.2 inches. By making tiles less thick it became possible to bake a number of tiles at one operation then the production cost was reduced significantly.&quot;</p><p><br /></p><p>The thick tin enamel coating is another positive sign as later pieces have a clear glaze instead</p><p><br /></p><p>Learning and lovin it <img src="styles/default/xenforo/smilies/smile.png" class="mceSmilie" alt=":)" unselectable="on" />[/QUOTE]</p><p><br /></p>

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