很久以来,由于人们对老照片的保护缺乏必要的认识以及受保管条件限制等诸原因,而使一些有特殊价值的图像(即正片与负片或早期的彩色玻璃反转片)受到了不同程度的损害,即使那些精心修复的“原版”图片,也因为使用频率过高,普遍存在着变黄、褪色、破裂、撕坏、刮伤、污染等现象,个别底片被氧化,虽经药液清洗,但改善效果不显著。多 For a long time, due to the lack of necessary knowledge about the protection of old photographs and the limitation of custody conditions, some special-valued images (ie, positive and negative films or early colored glass reversal films) were subject to varying degrees of Damage, even those well-restored “original ” picture, but also because of the frequency of use, prevalence of yellowing, fading, rupture, tear, scratch, pollution and other phenomena, the individual film is oxidized, Cleaning, but the improvement is not significant. many