Packaging and storage—
Preserve in well-closed containers.
Labeling—
The labeling indicates its viscosity, under specified conditions, in aqueous solution. The indicated viscosity may be in the form of a range encompassing 50% to 150% of the average value.
Identification—
A:
Stir about 1 g into 100 mL of water: it is dissolved completely to produce a colloidal solution that remains clear when heated to 60
.
B:
Place 1 mL of the solution from
Identification test
A on a glass plate, and allow the water to evaporate: a thin, self-sustaining film is formed.
C:
To 1 mL of a solution (1 in 2000) add 1 mL of phenol solution (1 in 20). Add 5 mL of sulfuric acid, shake, and allow to cool: the color of the solution so obtained becomes orange.
Viscosity 
911
—
When determined at the concentration and under the conditions specified in the labeling, its viscosity is not less than 50% and not more than 150% of the labeled viscosity, where stated as a single value, or it is between the maximum and minimum values, where stated as a range of viscosities.
pH 791:
between 6.0 and 8.5, in a solution (1 in 100).
Loss on drying 731—
Dry it at 105
for 3 hours: it loses not more than 10.0% of its weight.
