Abstract

The new official United States color standards for grading gum rosin are described and compared with the superseded 1923 Lovibond glass standards. The new standards are made of cemented combinations of Jena and Corning glasses, and show a better spectral match with rosin, higher luminous transmission, more regular spacing of colors on a chromaticity scale, and are more solidly constructed than the old standards. Spectral transmission curves for rosins and the glass standards are shown. The standard colors are specified in terms of the 1931 I.C.I. colorimetric coordinate system with its standard observer and standard illuminant <i>C</i>. Chromaticity tolerances are established for duplicate standards.

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References

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  1. Charles E. Smith, "History of the Development of Naval Stores Inspection and Standards." Naval Stores Rev. 42, No. 46, 16 (1933); 42, No. 47, 10 (1933). Drugs, Oils and Paints 48, No. 3 (1933); 48, No. 4 (1933). Oil, Paint and Drug Reporter (Feb. 6, Feb. 27, 1933).
  2. B. A. Brice, "A Color Analysis of the U.S. Rosin Standards," Naval Stores Rev. 43, Nos. 5, 6 (1933); American Ink Maker 11, No. 5, 27 (1933); Drugs, Oils and Paints 48, No. 4, 136 (1933).
  3. B. A. Brice, "Some Reasons for Modifying the U. S. Rosin Standards," Naval Stores Rev. 43, No. 30, 6 (1933); Drugs, Oils and Paints 48, No. 10, 380 (1933); Soap 9, No. 11, 23 (1933); Paint, Oil, and Chem. Rev. 95, No. 26, 8 (1933).
  4. K. S. Gibson, G. K. Walker, M. E. Brown, J. Opt. Soc. Am. 24, 58 (1934).
  5. The weak absorption band near 650 mµ present in most gum rosins, but not in wood rosins, is probably due to chlorophyll or a derivative. A weak band near 750 mµ is interpreted as an overtone band due to OH vibration in the resin acids.
  6. K, S. Gibson and F. K. Harris, Nat. Bur. Stand. Sci. Paper No. 547 (1927).
  7. D. B. Judd, J. Opt. Soc. Am. 23, 359 (1933).
  8. D. B. Judd, J. Opt. Soc. Am. 22, 72 (1932).
  9. See p. 363 of reference 7.
  10. D. B. Judd, J. Opt. Soc. Am. 25, 24 (1935).
  11. See p. 360 of reference 7.

Brice, B. A.

B. A. Brice, "Some Reasons for Modifying the U. S. Rosin Standards," Naval Stores Rev. 43, No. 30, 6 (1933); Drugs, Oils and Paints 48, No. 10, 380 (1933); Soap 9, No. 11, 23 (1933); Paint, Oil, and Chem. Rev. 95, No. 26, 8 (1933).

B. A. Brice, "A Color Analysis of the U.S. Rosin Standards," Naval Stores Rev. 43, Nos. 5, 6 (1933); American Ink Maker 11, No. 5, 27 (1933); Drugs, Oils and Paints 48, No. 4, 136 (1933).

Brown, M. E.

K. S. Gibson, G. K. Walker, M. E. Brown, J. Opt. Soc. Am. 24, 58 (1934).

Gibson, K. S.

K. S. Gibson, G. K. Walker, M. E. Brown, J. Opt. Soc. Am. 24, 58 (1934).

Gibson, S.

K, S. Gibson and F. K. Harris, Nat. Bur. Stand. Sci. Paper No. 547 (1927).

Harris, F. K.

K, S. Gibson and F. K. Harris, Nat. Bur. Stand. Sci. Paper No. 547 (1927).

Judd, D. B.

D. B. Judd, J. Opt. Soc. Am. 22, 72 (1932).

D. B. Judd, J. Opt. Soc. Am. 25, 24 (1935).

D. B. Judd, J. Opt. Soc. Am. 23, 359 (1933).

K,

K, S. Gibson and F. K. Harris, Nat. Bur. Stand. Sci. Paper No. 547 (1927).

Smith, Charles E.

Charles E. Smith, "History of the Development of Naval Stores Inspection and Standards." Naval Stores Rev. 42, No. 46, 16 (1933); 42, No. 47, 10 (1933). Drugs, Oils and Paints 48, No. 3 (1933); 48, No. 4 (1933). Oil, Paint and Drug Reporter (Feb. 6, Feb. 27, 1933).

Walker, G. K.

K. S. Gibson, G. K. Walker, M. E. Brown, J. Opt. Soc. Am. 24, 58 (1934).

Other (11)

Charles E. Smith, "History of the Development of Naval Stores Inspection and Standards." Naval Stores Rev. 42, No. 46, 16 (1933); 42, No. 47, 10 (1933). Drugs, Oils and Paints 48, No. 3 (1933); 48, No. 4 (1933). Oil, Paint and Drug Reporter (Feb. 6, Feb. 27, 1933).

B. A. Brice, "A Color Analysis of the U.S. Rosin Standards," Naval Stores Rev. 43, Nos. 5, 6 (1933); American Ink Maker 11, No. 5, 27 (1933); Drugs, Oils and Paints 48, No. 4, 136 (1933).

B. A. Brice, "Some Reasons for Modifying the U. S. Rosin Standards," Naval Stores Rev. 43, No. 30, 6 (1933); Drugs, Oils and Paints 48, No. 10, 380 (1933); Soap 9, No. 11, 23 (1933); Paint, Oil, and Chem. Rev. 95, No. 26, 8 (1933).

K. S. Gibson, G. K. Walker, M. E. Brown, J. Opt. Soc. Am. 24, 58 (1934).

The weak absorption band near 650 mµ present in most gum rosins, but not in wood rosins, is probably due to chlorophyll or a derivative. A weak band near 750 mµ is interpreted as an overtone band due to OH vibration in the resin acids.

K, S. Gibson and F. K. Harris, Nat. Bur. Stand. Sci. Paper No. 547 (1927).

D. B. Judd, J. Opt. Soc. Am. 23, 359 (1933).

D. B. Judd, J. Opt. Soc. Am. 22, 72 (1932).

See p. 363 of reference 7.

D. B. Judd, J. Opt. Soc. Am. 25, 24 (1935).

See p. 360 of reference 7.

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