Natural pH Test Papers - Recipes

[Guest guest]

I thought this was kinda cool, so I'm passing it along ... what a great

science project for the kids!

 

*Smile*

Chris (list mom)

http://www.alittleolfactory.com

 

~~~~~~~~~~~~~~~~~~

 

http://journeytoforever.org/biodiesel_testpaper.html

 

Test papers

 

 

From " The Household Cyclopedia " (1881):

http://www.publicbookshelf.com/public_html/The_Household_

<http://www.publicbookshelf.com/public_html/The_Household_Cyclopedia_of_

General_Information/phtestpa_bjd.html>

Cyclopedia_of_General_Information/phtestpa_bjd.html

 

Distilled water only should be used in these preparations. In preparing

the papers the liquid should be placed in an earthenware plate or dish,

and the paper carefully immersed in it so as to be uniformly wetted then

dried out of the reach of acid, ammoniacal, or other vapors likely to

affect it; and afterwards kept in bottles, jars, or cases.

 

 

Cabbage Paper

 

 

Make a strong infusion of red cabbage leaves, strain it, and evaporate

it by a gentle heat till considerably reduced. Then dip the paper in it

and dry it in the air. [This paper is of a grayish color; alkalies

change it to green, acids to red. It is a very delicate test; if

rendered slightly green by an alkali, carbonic acid will restore the

color.]

 

acid neutral base

Spectrum for Cabbage Water Indicator

<http://journeytoforever.org/media/c/cabbagepH.jpg>

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

 

From Miami Museum of Science

http://www.miamisci.org/ph/hexplore1.html

 

pH test strips from Red Cabbage

http://www.plantsfood.com/ph.htm

 

 

Brazil Paper

 

 

Dip paper in a strong decoction of Brazil wood and dry it. [it is

rendered purple or violet by alkalies; generally yellow by acids.]

 

 

Dahlia Paper

 

 

From the petals of violet-dahlias, as cabbage paper.

 

 

Elderberry Paper

 

 

This is merely paper stained with the juice of the berries. Its blue

color is changed to red by acids, and to green by alkalies.

 

 

Indigo Paper

 

 

Immerse paper in sulphate of indigo, wash it with water rendered

slightly alkaline, then with pure water, and dry it in the air.

 

 

Iodide of Potassium and Starch Paper

 

 

Mix starch paste with solution of iodide of potassium, and moisten

bibulous paper with it. [it becomes blue when exposed to ozone. Chlorine

has the same effect.]

 

 

Lead Paper

 

 

Paper dipped in a solution of acetate of lead. [When moistened it

detects sulphuretted hydrogen, which renders it black.

 

 

Blue Litmus Paper

 

 

Bruise 1 oz. of litmus in a mortar, and add boiling water; triturate

together, put them in a flask and add boiling water to make up to half a

pint; when cool strain it, and dip paper in it. More color may be

extracted from the litmus by hot water, but the liquid will require to

be concentrated by evaporation. [Acids change the color to red, but it

does not become green with alkalies.]

 

 

Red Litmus Paper

 

 

As the last, adding to the strained infusion few drops of nitric acid,

or of pure acetic acid.

 

 

Rose Paper

 

 

Make a strong infusion of the petals of the red rose, and dip unsized

paper in it. [Dipped in an alkaline solution so weak as not to affect

turmeric paper, it assumes a bright green color.]

 

 

Manganese Paper

 

 

Dip paper in a solution of sulphate of manganese. [it becomes black in

an ozonized atmosphere.]

 

 

Rhubarb Paper

 

 

Dip paper in a strong infusion of rhubarb, and dry it. [Alkalies render

it brown. It is not, like turmeric paper, affected by boracic acid.]

 

 

Starch Paper

 

 

This is merely paper imbued with starch paste. Cotton cord is sometimes

used instead of paper. [As a test for iodine, which turns it blue.]

 

 

Turmeric Paper

 

 

Boil 1 oz. of coarsely powdered turmeric-root in 1/2 a pint of water for

1/2 an hour, and strain; dip paper in the liquid and dry it. [it is

rendered brown by alkalies, and also by boracic acid and borates.]

 

 

 

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Keith Addison, unless otherwise stated, and may be copied and

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