ASTM D1684-96(2002)
(Practice)Standard Practice for Lighting Cotton Classing Rooms for Color Grading
Standard Practice for Lighting Cotton Classing Rooms for Color Grading
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 method of test for appraising the color quality of lamps procured for this purpose.
1.2 This standard does not purport to addressall 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
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D1684–96 (Reapproved 2002)
Standard Practice for
1
Lighting Cotton Classing Rooms for Color Grading
This standard is issued under the fixed designation D 1684; 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 (e) 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 2.2 Other Documents:
The Classification of Cotton, Agricultural Handbook Num-
1.1 This practice covers practices in general use in the
5
ber 566.
United States for lighting cotton classing rooms, provides
general background information regarding the development
3. Terminology
and establishment of these practices, and prescribes a test
3.1 Definitions:
method for appraising the color quality of lamps procured for
3.1.1 color grading, n—theactofidentifyingaspecimenby
this purpose.
a color grade or color score, that is specific to the color and the
1.2 This standard does not purport to address all of the
material graded.
safety concerns, if any, associated with its use. It is the
3.1.2 illumination, n—inlighting,thedensityorfluxoflight
responsibility of the user of this standard to establish appro-
on a unit area of surface.
priate safety and health practices and determine the applica-
3.1.2.1 Discussion—The lux (lx) is the SI unit of illumina-
bility of regulatory limitations prior to use.
tion and equals a luminous flux of one lumen per square metre
2. Referenced Documents of surface. The footcandle (fc) is the inch-pound unit of
illumination and equals a luminous flux of one lumen per
2.1 ASTM Standards:
3 square foot of surface. To convert footcandles to lux, multiply
D 123 Terminology Relating to Textiles
by 10.76391 (exactly).
D 1535 Practice for Specifying Color by the Munsell Sys-
4
tem
3.1.3 kelvin, n—the unit of thermodynamic temperature; the
SI unit of temperature for which an interval of one kelvin (K)
equals exactly an interval of one degree Celsius (1°C) and for
1
This practice is under the jurisdiction of ASTM Committee D13 on Textiles,
which a level of 273.15 K equals exactly 0°C.
and is the direct responsibility of Subcommittee D13.11 on Cotton and Fibers.
3.1.4 For definitions of other textile terms used in this
Current edition approved Oct 10, 1996. Published February 1997. Originally
practice, refer to Terminology D 123.
published as D 1684 – 59 T. Last previous edition D 1684 – 90.
2
The boldface numbers in parentheses refer to references listed at the end of this
practice.
3
5
Annual Book of ASTM Standards, Vol 07.01.
Available from Cotton Div.,Agricultural Marketing Service, U. S. Department
4
Annual Book of ASTM Standards, Vol 06.01.
of Agriculture, Washington, DC 20250.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D1684
4. Summary of Practice on the basis of the color the sample and the standard would
have in daylight. It is essential that the lighting in a classing
4.1 Artificial lighting is used in cotton classing rooms to
room is constant and that it makes the color of cotton appear as
simulate ideal daylight conditions in north latitudes with a
nearly as possible as it would in natural daylight.
moderately overcast sky. The quality and quantity of illumina-
5.2 Uniform lighting conditions permit classers to go from
tion, the geometry of illumination, the type of lighting unit and
one classing room to another without having
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.