Color charts are used to assess the water quality. This is for phosphoric acid.

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Filename:	tn037e-IMG_5326.jpg
Album name:	philbert / Northern Lake Toya 北洞爺湖（洞爺湖町）
Keywords:	hokkaido / toyako-cho / lake / toya / toya / high / school / students / water / samples
Filesize:	11 KiB
Date added:	May 20, 2008
Dimensions:	267 x 400 pixels
Displayed:	107 times
URL:	https://photoguide.jp/pix/displayimage.php?pid=21020
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