Recently, one from Italy and Poland scientific research group said, they found the real reason why paper aging. The use of this discovery, people can be more targeted to save precious calligraphy and painting the old, and do not add any chemical reagent in calligraphy and painting.
The scientists used Da Vinci's self portrait as the experimental object. Self portrait of Da Vinci, completed in 1513, the entire work only by a pink chalk painting form, while carrying this art paper is also very common, these factors make the perfect picture of human history this portrait is fragile, it is difficult to preserve. Now, Da Vinci's self portrait after nearly 5 centuries, due to the influence of humid air, the paper has been aged, and yellow. Italy Journal of science "Physics Letters" published the results of this study, and points out the reasons why the paper aging, is also "the chromophore" content increased. According to the experts explain, the chromophore is a component of the special paper, it can absorb light molecules, and with more light molecular number he absorbed, number of chromophore itself will increase, thereby forming a "vicious spiral", accelerate the aging degree of the paper, it also worth mentioning is, a lot of chromophores will in the paper of cellulose becomes yellow, this also explains why the aging of paper in daily life will become faster, and the color of the paper will gradually turn yellow. In addition, the scientists have also developed a detailed "ancient calligraphy and painting protection scheme", in clear label best environmental indicators preserved rare calligraphy and painting, which here includes the oxygen content, humidity, light intensity and so on, for the collection of enthusiasts reference.
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