litmus paper


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litmus

 [lit´mus]
a blue pigment prepared from Rocella tinctoria and other lichens.
litmus paper absorbent paper impregnated with a solution of litmus, dried and cut into strips. It is used to indicate the acidity or alkalinity of solutions. If dipped into alkaline solution it remains blue; acid solution turns it red. It is used to test urine and other body fluids; it has a pH range of 4.5 to 8.3.

litmus paper

[lit′məs]
Etymology: ONorse, litmosi, coloring herb; L, papyrus, paper
absorbent paper coated with litmus, a blue dye, that is used to determine pH. Acid substances or solutions turn blue litmus to red. Alkaline substances or solutions do not cause a color change in blue litmus. The pH range is 4.5 (red) to 8.5 (blue).

litmus paper

Chemically prepared blue paper that contains a hydrogen-ion sensitive dye, is turned red by acids, and remains blue in alkali solutions; pH range is 4.5 to 8.5.
See: indicator
See also: paper

litmus

a blue pigment prepared from Rocella tinctoria and other lichens.

litmus paper
absorbent paper impregnated with a solution of litmus, dried and cut into strips. It is used to indicate the acidity or alkalinity of solutions. If dipped into alkaline solution, it remains blue; acid solution turns it red. It is used to test urine and other body fluids; it has a pH range of 4.5 to 8.3.
References in periodicals archive ?
He didn't need to talk as he got out the litmus paper, test tubes and beakers.
STOURBRIDGE dip their litmus paper into the National Two North test-tube once again tomorrow with many predicting the next four weeks will be the most acidic test of all.
He confirmed that a "presumptive" test was taken which involved scrapping an area off onto a litmus paper then using two chemicals to test the area.
Does litmus paper turn blue or red when placed in an acid solution?
There's something peculiarly satisfying about paying a bill before, like litmus paper, it turns red.
Police have been testing drinks bottles with litmus paper for alcohol, talking to young people and test purchasing to check shops are not selling to those under age.
Which is extremely worrying, as Sir David says that butterflies are the litmus paper of nature.
The portable pH PAL tester is ideal for monitoring pH levels without the need of litmus paper.
Similar to Litmus paper, there is a color correlation chart that allows you to determine the pressure being measured.
Although home-made face masks are fun and cheap to make, to experiment at home you will need gauze and more than likely have to order litmus paper and a colour chart from a chemists, to check you are getting the balance right.
If the acid test is the ability to be alluring and soul-stirring regardless of the quality of the racing, the size of the crowd or the clemency of the weather, then Ludlow will turn the litmus paper pink every time.
Acids turn blue litmus paper red and usually have a sour taste.