钢铁化学分析大量采用比色法,广泛应用吸光-含量标准曲线,炉前化验颇感不便,将比色计改成直读式,使用甚感方便。方法:1.将比色计(581G 型或72型均可)的吸光刻度板取下,当作负片,在暗室中印制正片多张(可多印一些备用)。印制时裁一条整齐的黑纸遮去透光率部份,则正片的透光率部份呈白色,正片的吸光部份呈黑底及白色的吸光刻度(如图)。 Large-scale use of chemical analysis of steel colorimetric method, extensive application of absorbance - content of the standard curve, inconvenience inconvenient furnace test, the colorimeter into a direct-reading, very easy to use. Methods: 1. The colorimeter (581G type or 72 can be) absorbance scale plate removed, as a negative film, in the dark room to print positive film (can print some more reserve). Printed cut a piece of neat black paper cover part of the light transmittance, the positive part of the white light transmittance, light absorption part of the positive black and white light absorption scale (Figure).