ASTM D1684-07

Standard Practice for Lighting Cotton Classing Rooms for Color Grading

SIGNIFICANCE AND USE
This practice is useful for establishing and maintaining standard lighting conditions in cotton classing rooms. This permits the classer to make a valid assessment of the color grade of cotton. The cotton classer attempts to classify cotton on the basis of the color the sample and the standard would have in daylight. It is essential that the lighting in a classing room is constant and that it makes the color of cotton appear as nearly as possible as it would in natural daylight.
Uniform lighting conditions permit classers to go from one classing room to another without having to make adjustments for wide differences in the amount and quality of lighting.
SCOPE
1.1 This practice covers practices in general use in the United States for lighting cotton classing rooms, provides general background information regarding the development and establishment of these practices, and prescribes a test method for appraising the color quality of lamps procured for this purpose.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Dec-2006
• ICS: 91.160.10 - Interior lighting
• Technical Committee: D13 - Textiles
• Drafting Committee: D13.11 - Cotton Fibers

Relations

• Replaces: ASTM D1684-96(2002) - Standard Practice for Lighting Cotton Classing Rooms for Color Grading
• Effective Date: 01-Jan-2007
• Replaced By: ASTM D1684-07(2012) - Standard Practice for Lighting Cotton Classing Rooms for Color Grading
• Effective Date: 01-Jul-2012
• Referred By: ASTM D7139-20 - Standard Terminology for Cotton Fibers
• Effective Date: 01-Jan-2007

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D1684–07
Standard Practice for
1
Lighting Cotton Classing Rooms for Color Grading
This standard is issued under the fixed designation D1684; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Until 1940, practically all cotton classing was done in daylight, much of it in specially skylighted
rooms designed to provide sufficient and uniform lighting on the classing tables. Cotton classification
or classing is the art and science of describing the quality of cotton according to the official standards
of the United States. Grade is divided into two categories—color grade and leaf grade. Because color
grade is an important quality factor in establishing the price and use of cotton, the color quality of
lighting is important. The cotton classer attempts to class cotton on the basis of the color the sample
and the standard would have in daylight. In classing rapidly he refers to physical standards only
occasionally each day; therefore it is most important that the lighting in a classing room shall not only
provide a constant color but that it shall make the color of cotton appear as nearly as possible as it
would in daylight so that he can take full advantage of training and memory.
2
In the USA, daylight at about 7500 K is what the cotton classer (1,2,3), (as well as color matchers
in other industries (4,5,6)) has found in practice to be the minimum color temperature of preferred
daylight.
1. Scope D7139 Terminology for Cotton Fibers
1.1 This practice covers practices in general use in the
3. Terminology
United States for lighting cotton classing rooms, provides
3.1 For all terminology relating to D13.11, Cotton and
general background information regarding the development
Fibers, refer to Terminology D7139.
and establishment of these practices, and prescribes a test
3.1.1 The following terms are relevant to this standard:
method for appraising the color quality of lamps procured for
color grading, illumination, kelvin.
this purpose.
3.2 For all other terminology relating to textiles, refer to
1.2 This standard does not purport to address all of the
Terminology D123.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Summary of Practice
priate safety and health practices and determine the applica-
4.1 Artificial lighting is used in cotton classing rooms to
bility of regulatory limitations prior to use.
simulate ideal daylight conditions in north latitudes with a
moderately overcast sky. The quality and quantity of illumina-
2. Referenced Documents
3
tion, the geometry of illumination, the type of lighting unit and
2.1 ASTM Standards:
pattern for installation, the color of surroundings, and mainte-
D123 Terminology Relating to Textiles
nance of lighting equipment are specified in this practice.
1
ThispracticeisunderthejurisdictionofASTMCommitteeD13onTextilesand
5. Significance and Use
is the direct responsibility of Subcommittee D13.11 on Cotton Fibers.
5.1 This practice is useful for establishing and maintaining
Current edition approved Jan. 1, 2007. Published January 2007. Originally
approved in 1959 T. Last previous edition approved in 2002 as D1684 – 90(2002). standard lighting conditions in cotton classing rooms. This
DOI: 10.1520/D1684-07.
permits the classer to make a valid assessment of the color
2
The boldface numbers in parentheses refer to references listed at the end of this
grade of cotton. The cotton classer attempts to classify cotton
practice.
3
on the basis of the color the sample and the standard would
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
have in daylight. It is essential that the lighting in a classing
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D1684–07
room is constant and that it makes the color of cotton appear as 6.2 Tolerances for meeting this standard for color quality
nearly as possible as it would in natural daylight. are 6200 K correlated color temperature of color, and for
5.2 Uniform lighting conditions permit classers to go from spectral quality the spectral distribution shall be as close as
one classing room to another without having to make adjust- possible to that shown in Fig. 1; in no case shall the color
ments for wide differences in the amou
...