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15th November 2017 um 11:19 am Uhr
#16822
罗雁 LuoYan
Administrator
Hi riekjecares, after consulting a couple of mounting masters in China, here we got the reply: there is no specific requirement on which side. However, it is quite common to use the smooth side out while keep the rough side in for the painting heart.
I am not sure the reason behind this practice. I have checked some mounted paintings and found the smooth side seems to be on top always.