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

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
References in periodicals archive ?
Checking milk for antibiotic residues is typically carried out with a non-reusable litmus paper testing kit.
The litmus paper familiar from high-school chemistry class and other pH meters gauge how acidic or basic a solution is.
So this tournament is something of a litmus paper and I believe we'll be surprised by the attitude on both sides of the Severn Bridge.
We practice making sanitation buckets and checking them with litmus paper. Proper food storage--including rotation, labeling, and storing ready-to-eat foods above raw foods--also minimizes the chances of cross-contamination.
4 cups of water * ** vinegar * ** thermometers ** blue litmus paper (* Teachers: See teacher's edition for details.)
Early successes with this approach include ChemSensing, a two-year-old company that has developed a sort of digital form of litmus paper, for detecting chemicals, ready to go into production.
These chips would be a high-tech litmus paper to signal the presence of specific molecules plus their properties and concentration.
Piero Brunello examines the functions of open-air seats in childhood, youth, adult life, and old age, while the anthropologist Franco La Cecla, who argues that benches are the litmus paper of a country's democracy and tolerance, notes the tendency of big American and European cities to `extinguish' public benches:
To test pH, you can get a digital meter for about $50, or you can get litmus paper or a dropper kit like the ones used for pools.
The precise PSI can be determined by comparison of the sensor film to a color calibration chart, much like Litmus paper, or by using one of several imaging systems that SPI supplies.
THERE'S no bit of litmus paper that turns blue for gay, yellow for straight and green for bi.