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en.wikipedia.org/wiki/Bromothymol_blue

Bromothymol blue is a pH indicator. It is mostly used in applications that require measuring substances that would have a relatively neutral pH (near 7). A common use is for measuring the presence of carbonic acid in a liquid. ... Amniotic fluid typically has a pH > 7.2, bromothymol will therefore turn blue when brought in ...

en.wikipedia.org/wiki/Methylene_blue

Methylene blue, also known as methylthioninium chloride, is a medication and dye. ... Use often turns the urine, sweat, and stool blue to green in color. ... Methylene blue can reduce the half life of methemoglobin from hours to minutes. .... The presence of free dye solution can be checked with stain test on a filter paper.

www.answers.com/Q/Paper_that_is_blue_will_turnstay_what_color_in_the_presence_of_a_strong_base

Paper that is blue will turn/stay _____ in the presence of a strong base.

www.answers.com/Q/What_color_will_blue_litmus_paper_turn_in_presence_of_a_strong_base

Paper that is blue will turn or stay what color in the presence of a strong base? Stay blue ... What color does litmus paper turn when dipped in a strong base?

www.testprepreview.com/modules/generalscience1.htm

Litmus paper that is blue will turn/stay _____ in the presence of a strong base. A. Orange B. Red C. Blue D. Green. 11. Breathing properly requires the presence ...

www.tutorvista.com/chemistry/red-litmus-paper-blue

Litmus paper is used to test whether the given solution is acidic or alkaline in nature. ... In other words acids change blue litmus paper to red; bases change red ... When a red litmus paper is immersed in a base or alkaline, the red litmus paper turns blue ... The greater the concentration of OH- ions, the stronger is the base.

genchem.rutgers.edu/litmus.html

red litmus turns blue in base; blue litmus turns red in acid. The key word is turns. If red litmus is put in a solution and remains red it does not mean the solution is ... Gasses change the color of litmus paper over its entire exposed surface, not just  ...

chemistry.elmhurst.edu/vchembook/186indicator.html

The most common indicator is found on "litmus" paper. It is red below pH 4.5 and blue above pH 8.2. ... Base, stays same, turns blue ... A properly selected acid- base indicator can be used to visually "indicate" the approximate pH of a sample.

www.scientificamerican.com/article/bring-science-home-cabbage-chemistry

Jan 26, 2012 ... To tell if something is an acid or a base, you can use a chemical ... Consequently, the color an anthocyanin solution turns can be used to ... you should now have only liquid that will either be purple or blue in ... To reveal the message, paint cabbage-indicator over the paper with a ... Stay Ahead of the Curve.