From that point on, price attempts to reclaim that mid-November range on steadily decreasing buying volume (the greyish bars).

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It seems a layer of varnish added later to protect the work is in fact turning the yellow to a greyish-orange colour.

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Mr Rosenblum's vintage Hine photographs were cooler, almost greyish in tone compared with the warm brown tints of Hine's other vintage work.

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The new work was begun during a conservation treatment in 2009, when conservators found that the yellows in Flowers In A Blue Vase - this time from a pigment called cadmium yellow - had turned greyish and cracked.

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Nicky now realises she does have some signs of OI: poor, pearly or translucent teeth, a greyish tinge to her eyes which look similar to her brother, Wayne, who has been diagnosed as suffering OI, and loose joints.

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