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Test Papers
Assorted Test Papers
Supplied in closed plastic containers of 100 strips.
Catalog No. Description Use
Price
Per Vial 12 Vials
AP7901 Cobalt Chloride Paper indicates relative
humidity by color change:
pink indicates high humidity;
blue indicates low humidity.
$2.14 $24.24
AP7912 Congo Red For strong acids.
pH 3.0 (blue-violet) to 5.0 (red)
1.75 19.80
AP7893 Lead Acetate Used to test for hydrogen sulfide
(H2S) vapors. Paper must be
moistened with water prior
to use.
1.80 20.64
AP7923 Litmus, Blue Used to test for acids.
pH 4.3 (red) to 6.8 (blue-violet)
1.36 14.88
AP7934 Litmus, Neutral Used to test for acid or alkali. 1.25 13.68
AP7945 Litmus, Red Used to test for alkali.
6.8 (blue-violet) to 8.1 (blue)
1.31 14.28
AP7967 Methyl Violet pH 0.2 (yellow) to
2.0 (blue-violet)
1.96 22.44
AP7978 Phenolphthalein Very sensitive to ammonia
vapors. pH 8.2 (colorless) to
10.0 (pink)
1.85 21.00
AP7989 PTC*
(phenylthiocarbamide)
Used to test for the genetic
ability to experience a bitter
taste from PTC. Occurs in 70%
of the population.
2.40 27.36
AP7890 Potassium Iodide,
Starch
Used to test for peroxides and
other oxidizing agents. Color
varies from white through blue
to black.
2.05 23.28
AP7891 Sodium Benzoate
Taste Test
Used to test for genetic ability to
taste sodium benzoate. This may
taste sweet, bitter, salty, or be
tasteless, depending on genetic
characteristics.
3.00 34.20
AP7892 Thiourea
Taste Test
Used to test for the genetic
ability to experience a bitter
taste from thiourea. Some
individuals can taste either
PTC or thiourea, but not both.
3.00 34.20
AP7990 Control
Taste Paper
Used as an untreated control
for taste tests with PTC, sodium
benzoate and thiourea.
1.31 14.64
APPARATUS TEST PAPERS
Test Papers, Strips
AP7901, etc.
Re-blue Blue Litmus Paper
Blue litmus paper can turn red over time due to absorption of carbon
dioxide in the air. To re-blue your blue litmus paper, place a spatulatip
full (approximately 1 g) of powdered ammonium carbonate
(NH4)2CO3 in the vial with the blue litmus paper.
PTC Paper*
PTC paper is paper soaked with phenylthiocarbamide (PTC). The LD50 for PTC is
3 mg/kg. Such a low LD50 suggests that this is a very toxic substance. The solution
to make the taste test paper contains approximately 50 mg of PTC per liter
of water. We calculate that each strip of PTC paper would contain approximately
0.03 mg of PTC. We estimate that a person weighing about 50 kg (110 pounds)
would have to lick and ingest 5,000 2" x 1/4" strips of PTC paper to reach the LD50.
A few sensitized individuals may have an allergic reaction to PTC.
Acid Rain Test Strips
Kit contains 15 strips of pH test paper and a color comparison
chart—designed for measuring the pH of rain in the range of
3.0 to 6.0.
Catalog No. Description Price/Each
AP1834 Acid Rain Test Strips $1.36
Lead Testing Paper
Color change of pink to a deep purple-red indicates the
presence of lead in solutions or on surfaces. Limits of
sensitivity: 0.05 micrograms on surfaces, 5 milligrams/
liter (5 ppm) in solutions. The presence of as little as 50
ppb in solution can be determined by using evaporation
techniques. Forty 25 x 40 mm size sheets.
Catalog No. Description Price/Each
AP9288 Lead Testing Paper $62.45
TEST PAPERS—pH continued on next page.
Acid Rain Survey Kit
Each kit includes enough materials for
an entire class—15 sample tubes with
caps, 5 color comparison charts and
enough test paper (pH 3.0–6.0) for 75
determinations. Also included is a vial
of 100 of Hydrion 0–12 pH test paper for
testing and comparing the pH values
of other liquids. All components are
completely portable for use in the field.
Catalog No. Description Price/Each
AP7054 Acid Rain Survey Kit $27.90
Water Hardness Testing Paper See page 146.
Test Papers—pH
Hydrion AB
pH Test Paper
Hydrion AB pH test paper displays sharp
color changes that cover the pH range
between 2.0 and 11.0. Type A paper
covers the even pH range between 2.0
and 10.0 (2–4–6–8–10). Type B paper covers the odd
pH range between 1.0 and 11.0 (3–5–7–9–11). The AB
dispenser contains 30 feet of pH paper—enough paper
for over 200 tests. Supplied in a double roll dispenser
with color charts and convenient tear-off tabs. Refills contain five 15-foot rolls of one
type of paper and two color charts. Packed in heat-sealed aluminum foil and tightly
secured in a plastic case.
Hydrion AB pH Test Strips are the same paper as the Hydrion AB pH Test Paper,
but packaged in convenient strips. Each vial contains 100 strips of one type of paper.
Type A covers even pH intervals (2, 4, 6, 8, 10). Type B covers even pH intervals (1, 3,
5, 7, 9, 11).
Catalog No. Description Price/Each
AP150 Hydrion AB pH Test Paper, Roll $12.20
AP148 Type A Refill, Roll 26.55
AP149 Type B Refill, Roll 26.55
Catalog No. Description Price/Vial Price/Pkg. of 10 Vials
AP147 Type A pH Test Strips $2.10 $18.60
AP146 Type B pH Test Strips 2.10 18.60
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