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在磨制岩石及古生物切片时,往往要用大量的加拿大树胶。但这种树胶要靠进口,且价值昂贵(每斤约值人民币120元,并且有时还买不到了)。为此,我们自一九五五年以来,曾几次地摸索试制过几种加拿大树胶的代用品,但颜色,折光率均不够满意。双反运动以来,在党的领导下,我们破除了迷信,解放了思想,重新来进行试制。正在此时,我们看到了科学通报1958年11期刊载的余国钧同志所写的“用中国光性松脂胶代替加拿大树胶”一文。参考该文后,我们经过几次试制,终于制成了这种树胶。
When grinding rock and paleontological slices, it is often necessary to use large amounts of Canadian gum. However, this kind of gums rely on imports, and are expensive (about RMB 120 yuan per catty, and sometimes can not be bought). For this reason, we have tried several times to experiment with alternatives to Canadian gum since 1955, but the color and refractive index are not satisfactory. Since the double-reverse campaign, under the leadership of the party, we have got rid of superstition, liberated our thinking and re-run trial production. It is at this time that we have read the article entitled “Replacement of Canadian Gum with Chinese Photoresist Resin” by Comrade Yu Guojun published in Science Bulletin, 1958-11. After reference to the article, after several trials we finally made this gum.