| 摘要 |
PROBLEM TO BE SOLVED: To provide a coloring sheet easily allowing vivid color identification to an organic solvent such as a chlorine solvent, alcohol and amine even in the presence of water, particularly assuming the case of flowing out in drainage. SOLUTION: The color identification test paper contains at least three kinds of coloring agents and a paper strengthening agent and has the hue of paper in a range of 10.0 R to 10.0 Y in Munsell hue, the brightness of color in a range of 5.0 to 10.0 in Munsell value and saturation in a range of 0.5 to 5.0 in Munsell chroma in a Munsell color system, and further has the bulk density of paper in a range of 0.1 g/cc to 1.0 g/cc, the thickness in a range of 0.1 mm to 0.3 mm and the Steckigt sizing degree of paper 100 sec or longer. The color identification paper turns red when coming in contact with the chlorine solvent, turns yellow when coming in contact with alcohol and turns dark green-blue when coming in contact with amine. The color identification test paper assuming more vivid colors by adding hue adjusting dyes is laminated into a sheet like material to form this coloring sheet.
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