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This test method covers two procedures for an approximate determination pf the presence pf injurious organic impurities in fine aggregates that are to be used in hydraulic cement mortar or concrete.

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- C 33 Specification for Concrete Aggregates
- C 87 Test Method for Effect of Organic Impurities in Fine Aggregate on Strength of Mortar
- C 125 Terminology Relating to Concrete and Concrete Aggregates
- C 702 Practice for Reducing Samples of Aggregate to Testing Size
- D 75 Practice for Sampling Aggregates
- D 1544 Test Method for color of transparent liquids (Gardner color Scale)

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This test method is used in making a preliminary determination of the acceptability of fine aggregates with respect to the requirements of Specification C 33 that relate to organic impurities.
When a sample subjected to this test produces a color darker than the standard color it is advisable to perform the test for the effect of organic impurities on the strength of mortar in accordance with Test Method C 87.

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- Glass Bottles: Colorless glass graduated bottles, approximately 240 to 470-mL (8 to 16-oz) nominal capacity, equipped with watertight stoppers or caps, not soluble in the specified reagents.
- Standard Color Solution Level: 75 mL.
- Fine Aggregate Level: 130 mL.
- NaOH Solution Level: 200 mL.
- Glass Color Standard.

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- Reagent Sodium Hydroxide Solution (3 %)
- Standard Color Solution

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The sample shall be selected in general accordance with Practice D 75.

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The test sample shall have a mass of about approximately 450 g (1 lb) and be taken from the larger sample in accordance with Practice C 702

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- Fill aStopper the bottle, shake vigorously, and then allow to stand for 24 h.  to the approximately 130-mL, level with the sample of the fine aggregate.
- Add the sodium hydroxide solution until the volume of the fine aggregate and liquid, indicated after shaking, is approximately 200 mL
- Stopper the bottle, shake vigorously, and then allow to stand for 24 h.

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- Standard Color Solution Procedure: At the end of the 24-h standing period, fill a glass bottle to the approximately 75-mL.
- Hold the bottle with the test sample and the bottle with the standard color solution side-by-side, and compare the color of light transmitted through the supernatant liquid above the sample with the color of light transmitted through the standard color solution.
- Record whether the color of the supernatant liquid is lighter, darker, or equal to the color of the standard color solution.
- Glass Color Standard Procedure: To define more precisely the color of the supernatant liquid of the test sample, five glass standard colors shall be used using the following colors

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When a sample subjected to this procedure produces a color darker than the standard color, or Organic Plate No. 3.
the fine aggregate under test shall be considered to possibly contain injurious organic impurities.
It is advisable to perform further tests before approving the fine aggregate for use in concrete.