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A gloved hand uses blue tweezers to handle litmus paper near a petri dish.

Place litmus paper in a glass of tap water and check the pH of the water

universal indicator paper with acidic testing on yellow background.

Water pH test, litmus paper indicator

Woman doing the pH test with strips in a liquid glass and showing to the camera

Check the pH of tap water by dipping litmus paper in the water and placing it on the scale

Woman holding the pH test and showing a strip with the color green that is related to pH 7.0

Litmus test, litmus paper applied to the pH scale

Close up of purple metal litmus as background

Close-up gloved hands holding litmus indicator

Litmus paper to test the pH level of urine

Neutral pH of water, test water with litmus paper

A petri dish for chemical experiments with white granules against the background of other laboratory glassware. Selective focus.

Acid - base detection through litmus paper. The color of the paper identifies an acid or basic solution

PH test paper (Litmus paper) comes in various colors

test strip with water sample, water PH testing

Female chemist holding litmus paper in hands. Analyzes ph test in a chemical laboratory. Chemistry industry education concept

Water pH measurement test. Yellow strip in a woman's hand

gloved hand holds neutral litmus paper on test tube with sample of natural drinking water over bottle on light desk

Ph test of water acidity, closeup

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