1、Designation:D168407(Reapproved 2020)Standard Practice forLighting Cotton Classing Rooms for Color Grading1This standard is issued under the fixed designation D1684;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revi
2、sion.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONUntil 1940,practically all cotton classing was done in daylight,much of it in specially skylightedrooms designed to provide suffici
3、ent and uniform lighting on the classing tables.Cotton classificationor classing is the art and science of describing the quality of cotton according to the official standardsof the United States.Grade is divided into two categories color grade and leaf grade.Because colorgrade is an important quali
4、ty factor in establishing the price and use of cotton,the color quality oflighting is important.The cotton classer attempts to class cotton on the basis of the color the sampleand the standard would have in daylight.In classing rapidly he refers to physical standards onlyoccasionally each day;theref
5、ore it is most important that the lighting in a classing room shall not onlyprovide a constant color but that it shall make the color of cotton appear as nearly as possible as itwould in daylight so that he can take full advantage of training and memory.In the USA,daylight at about 7500 K is what th
6、e cotton classer(1-3),2(as well as color matchersin other industries(4-6)has found in practice to be the minimum color temperature of preferreddaylight.1.Scope1.1 This practice covers practices in general use in theUnited States for lighting cotton classing rooms,providesgeneral background informati
7、on regarding the developmentand establishment of these practices,and prescribes a testmethod for appraising the color quality of lamps procured forthis purpose.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user o
8、f this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the D
9、ecision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D123 Terminology Relating to TextilesD7139 Terminology for Cotton Fibers3.Terminol
10、ogy3.1 For all terminology relating to D13.11,Cotton andFibers,refer to Terminology D7139.3.1.1 The following terms are relevant to this standard:color grading,illumination,kelvin.3.2 For all other terminology relating to textiles,refer toTerminology D123.4.Summary of Practice4.1 Artificial lighting
11、 is used in cotton classing rooms tosimulate ideal daylight conditions in north latitudes with amoderately overcast sky.The quality and quantity ofillumination,the geometry of illumination,the type of lightingunit and pattern for installation,the color of surroundings,andmaintenance of lighting equi
12、pment are specified in this prac-tice.1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.11 on Cotton Fibers.Current edition approved July 1,2020.Published August 2020.Originallyapproved in 1959 T.Last previous edition approv
13、ed in 2012 as D1684 07(2012).DOI:10.1520/D1684-07R20.2The boldface numbers in parentheses refer to references listed at the end of thispractice.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volum
14、e information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardizat
15、ion established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.15.Significance and Use5.1 This practice is useful for establishing and maintainingstandard lighting
16、 conditions in cotton classing rooms.Thispermits the classer to make a valid assessment of the colorgrade of cotton.The cotton classer attempts to classify cottonon the basis of the color the sample and the standard wouldhave in daylight.It is essential that the lighting in a classingroom is constant and that it makes the color of cotton appear asnearly as possible as it would in natural daylight.5.2 Uniform lighting conditions permit classers to go fromone classing room to another without havin
