الوصفColortest.jpg	website: http://www.fda.gov/oc/history/default.htm organisation: FDA A chemist is shown using column chromatographic apparatus in the mid-1950s to separate constituents in a coal tar color analysis. http://www.fda.gov/privacy.html#web
التاريخ	none
المصدر	en:Image:Colortest.jpg
المؤلف	FDA
الترخيص (إعادة استخدام هذا الملف)	Public domainPublic domainfalsefalse Unless otherwise noted, the contents of the Food and Drug Administration website (www.fda.gov) —both text and graphics— are public domain in the United States. [1] (August 18, 2005, last updated July 14, 2015)

(del) (cur) 16:51, 15 July 2005 . . V8rik (Talk | contribs) . . 215×267 (53,449 bytes) (website: http://www.fda.gov/oc/history/default.htm organisation: FDA A chemist is shown using column chromatographic apparatus in the mid-1950s to separate constituents in a coal tar color analysis. http://www.fda.gov/privacy.html#web )