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<p>[QUOTE=&quot;Rec, post: 2794460, member: 6899&quot;]Thank you for your contribution. I promised not to respond anymore but since you are a potter I hope you will shed some light on the following so that I can better understand how to interpret deadbubbles<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie81" alt=":shy:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie81" alt=":shy:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie81" alt=":shy:" unselectable="on" unselectable="on" /></p><p><br /></p><p>I understood from the deadbubles studies that a pinhole is darker in color when it has been exposed to elements of nature <u><b>for a long time.</b></u></p><p>In addition to all other known techniques, I see that there is a tendency that the presence of dead bubbles, the shape and color of dead bubbles have been used more often in recent years to analyze the age of a porcelain and to determine the authenticity of a porcelain. Because creating a dead bubble with correct color depth is somewhat difficult to imitate and would be very costly for forger.</p><p><br /></p><p><u>assuming that this vase is not a fake; </u>doesn&#039;t the dark brown to black pinholes show us that this vase is quite old?</p><p><br /></p><p>Although we did not get a microscopic view of the pinholes,</p><p>judging the photos of Gianluca.. I see that part of the black pinholes are now covered with blue and clear glass and others only with clear glass. Top layer does not appear to be affected. I don&#039;t see any crater on the area where the bubbles are burst</p><p><br /></p><p>what does the presence of other colors or clear glass <u><b>in the black / brown pinhole</b></u> say?&nbsp; </p><p><br /></p><p>what it means if the top layer does not have a crater shape while the pinhole is dark / brown </p><p><br /></p><p><br /></p><p>I dont understand what you trying to say. coud you explain a bit more?</p><p><br /></p><p>as a collector I use the presence / absence of a certain color in addition to all other elements to determine the authenticity of a porcelain. For example, I know that kangxi blue is a different color blue than a ming blue or a blue color that you see on a 19th century Italian porcelain or an English one.[/QUOTE]</p><p><br /></p>

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