The Activator, Volume 1 , Number 3, December 1944 Page: 4 of 24
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o Accutint pH test papers are simple, accurate
and rapid means of making hydrogen ion determi-
nations. Merely place a drop of the solution or
press a small amount of the moist solid being
examined on a strip of the test paper, observe the
color change which occurs, then make a compari-
son with the printed color standard on the vial.
Each strip reacts to produce a distinctive color
reaction at each pH value within its range or
indicates that an adjacent range must be used for
Wide range and fractional range Accutint test
papers are available. The use of wide range pa-
pers is recommended where pH values are not
known to be within the limits of a fractional
range paper. By using wide range paper for an
initial determination, pH can be measured within
1.0 pH, and, to obtain greater accuracy, a sec-
ond determination is made with the correct frac-
tional range paper, to within 0.3 pH.
Because fractional range papers overlap each
other, it is possible to make readings to 0.2 or 0.1
pH. For example, the following pH values can
be determined from the color standards of the
various papers covering the range 5.0 to 8.8 pH:
5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.9, 6.1, 6.2,
6.3, 6.4, 6.6, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5,
7.8, 7.9, 8.1, 8.2, 8.4, 8.6, 8.8.
If a pH indication is the first or last color of
a fractional range paper, a second determination
using paper of the next range can be made to
check the original measurement. When a paper
from a particular fractional range registers a
color shade between two of the color standards
of its range, the paper is signaling the user to
turn to the adjacent fractional range above or
below where the intermediate value will be re-
vealed by its distinct color standard.
Accutint pH test papers offer a complete and
accurate pH service of highest sensitivity. It is
comprised of three wide ranges or pH localizers
of superior accuracy in the high alkaline and high
acid ranges as well as in all the middle ranges
Each vial supplied with a printed color standard
Wide Range Test Paper
No. A B C
pH Range 0.0-5.0 1.0-12.0 9.0-14.0
b Fractional Range Test Paper
No. 10 20 30 40 50
pH Range 0.0-1.2 0.8-2.4 1.3-3.3 1.4-3.0 1.7-3.3
No. 60 70 80 90 100
pH Range 2.7-4.7 3.9-5.4 5.0-6.6 5.2-6.9 5.3-7.0
No. 110 120 130 140 150
pH Range 6.1-7.4 6.9-8.4 7.2-8.8 7.3-8.8 8.4-9.4
No. 160 170 180 190 200
pH Range 8.9-10.0 9.1-10.4 10.1-12.0 10.7-14.0 12.4-11.0
These are supplemented by 20 fractional ranges,
permitting close determinations to 0.1 pH. By
using the complete set, 144 pH values between
pH 0 and pH 14 are determinable.
The wide and fractional ranges are best pre-
sented in correlation by color and by graph by the
Master Accutint Color Chart, No. 5-65278 which
illustrates color standards and readings of every
pH value in each of the 23 fractional and wide
ranges. This chart helps in the selection of the
most suitable ranges or papers for a specific
5-65277 Accutint Test Papers. The strips are
prepared in pad form, each pad consisting of 20
strips. Packed in glass vials each containing 5
pads or 100 strips. Color chart and instructions
are provided with each vial.
Per V ial .....................................$ .65
Per 72 Vials, 10% Discount
Per 144 Vials, 15% Discount
Per 288 Vials, 20% Discount
S-65278 Accutint Master Color Chart. As de-
scribed above. Designed to aid in the selection of
the most suitable paper for a specific purpose.
Each ............................. ....................... $3.25
Write for bulletin of prices and discounts.
E. H. SARGENT & CO.. 155-156 East Superior Street, Chicago 11, Illinois
Michigan Division: 1959 East Jefferson, Detroit 7, Michigan
A G E N~
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S C I E N T I F I C L A B 0 R A T 0 R Y S U P P L I E
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American Chemical Society. Dallas/Fort Worth Section. The Activator, Volume 1 , Number 3, December 1944, periodical, December 1944; [Dallas, Texas]. (digital.library.unt.edu/ark:/67531/metadc75209/m1/4/: accessed January 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .