|MadSci Network: Biochemistry|
rather than using pen we use pencil to mark on chromatography paperwhy do we do like so?
Re: why do we use pencil for paper chromatography Greetings Amal, Thanks for submitting your question about chromatography to the MadSci Network. I am pleased to let you know that questions related to yours have been answered on our site. You can also use our search engine to locate answers containing the word(s) chromatography: http://www.madsci.org/MS_search.html A pencil mark consists of shards of lead or graphite that are physically abraded from the pencil tip and are held onto the surface of the paper by mechanical forces. Ink is a solution that adsorbs onto the surface of the paper. Because it is a solution, some of the components of the ink may be soluble in the solvent you are using in your chromatography, in which case the ink mark will spread as the solvent front advances. The easiest way to find the answer to this question is to try it with various inks from various pens as well as marks from several pencils. If, after reviewing the previous answers, you still have a question, feel free to submit a new question, but please be sure to tell us that you have already searched the archives, along with what is not in the archives that you want to have additional information about, or what in the the archived answers you do not understand. This will help us to give you the best answer possible. Cheers! Steve Mack, Moderator MadSci Network _______________________________________________________________ rather than using pen we use pencil to mark on chromatography paperwhy do we do like so? ________________________________________________________________ MadSci Network http://www.madsci.org/ email@example.com
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