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Hand dripping pH indicator into test tube with visible color change in test fluid

Stock Photo:
Image ID: 65569537
Copyright:
Small
500x333 6.9"x4.6" (72dpi) 105 KB
Med
1000x666 3.3"x2.2" (300dpi) 345 KB
Large
3637x2424 12.1"x8.1" (300dpi) 2.2 MB
Super
7274x4848 24.2"x16.2" (300dpi) approx.6.7 MB
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