United States Scorched Particle Standards for Dry Milk (January 26, 1951)

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Marketing and

Regulatory

Programs

Agricultural

Marketing 

Service

Dairy

Program

United States Scorched

Particle Standards for 

Dry Milk 

Effective January 26, 1951

(Reprinted – December 2018)
United States Scorched Particle Standards for Dry Milk (January 26, 1951)

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United States Scorched Particle Standards for Dry Milk

Section Page No.

§ 58.2676 United States sediment scorched particle standards for dry milks. ................ 4

§ 58.2677 Preparation of discs........................................................................................ 4

§ 58.2678 General........................................................................................................... 5
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§ 58.2676 United States sediment scorched particle standards for dry milks.

The standards contained in this subpart consist of four (4) discs, each of which 

represents one of the following:

7.5 mg. of scorched particles.

15.0 mg. of scorched particles.

22.5 mg. of scorched particles.

32.5 mg. of scorched particles.

§ 58.2677 Preparation of discs.

Each of the four (4) discs was prepared in accordance with the procedure set forth in this

section.

(a) Spread five grams of nonfat dry milk solids evenly over a petri dish and heat at 

119°C. for four hours to produce scorched particles.

(b) After heating, keep in desiccator until the particles are weighed.

(c) Prepare scorched particle solution by mixing 0.50 gram of the scorched particles

(prepared in accordance with paragraph (a) of this section) gently with 

approximately 20 ml. of a 50 percent filtered sucrose solution. Transfer the 

mixture to a 200 ml. volumetric flask and dilute to volume using a 50 percent 

filtered sucrose solution and mix thoroughly.

(d) To provide particles which, in appearance, are similar to highly scorched, or 

burned, protein particles, prepare at least 1.0 gram of a charcoal mixture by 

using the following specified percentages of charcoal of the designated meshes:

200 mesh charcoal: 20 percent.

150 mesh charcoal: 50 percent.

100 mesh charcoal: 20 percent.

65 mesh charcoal: 10 percent

(e) Prepare charcoal solution by placing 1.0 gram of the charcoal mixture (prepared 

in accordance with paragraph (d) of this section) in a one-liter volumetric flask 

and dilute to volume, using a 50 percent filtered sucrose solution and mix 

thoroughly.

(f) Prepare each of the following sample solutions:

1. Sample solution 1. Mix 75 ml. of filtered, reconstituted, spray process 

nonfat dry milk solids with (i) a quantity of scorched particle solution 

containing scorched particles aggregating 7.425 mg. and (ii) a quantity of 

charcoal solution containing charcoal particles aggregating 0.075

mg. The particle content of this sample solution is 7.5 mg.

2. Sample solution 2. Mix 75 ml. of filtered, reconstituted, spray process 

nonfat dry milk solids with (i) a quantity of scorched particle solution 
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containing scorched particles aggregating14.85 mg. and (ii) a quantity of 

charcoal solution containing charcoal particles aggregating 0.15 mg. The 

particle content of this sample solution is 15.0 mg.

3. Sample solution 3. Mix 75 ml. of filtered, reconstituted, spray process 

nonfat dry milk solids with (i) a quantity of scorched particle solution 

containing scorched particles aggregating 22.2 mg. and (ii) a quantity of 

charcoal solution containing charcoal particles aggregating 0.30 mg. The 

particle content of this sample solution is 22.5 mg.

4. Sample solution 4. Mix 75 ml. of filtered, reconstituted, spray process 

nonfat dry milk solids with (i) a quantity of scorched particle solution 

containing scorched particles aggregating 31.9 mg. and (ii) a quantity of 

charcoal solution containing charcoal particles aggregating 0.60 mg. The 

particle content of this sample solution is 32.5 mg.

(g) Sir Stir each sample solution immediately prior to filtering and filter through a 

standard lintine disc (11⁄4” diameter) using a filtering surface of 11/8” diameter. 

Rinse the container of each sample solution with filtered, reconstituted, spray 

process nonfat dry milk solids and filter the rinse through the applicable disc.

(h) Dry the discs at room temperature.

§ 58.2678 General. 

To facilitate the use and availability of these scorched particle standards, a composite

photograph of the four (4) discs is made a part hereof; and a copy of the photograph 

may be obtained, upon request, from Dairy Program, Agricultural Marketing Service, 

U.S. Department of Agriculture, Washington, DC 20250.