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Chromatography

Chromatography. Aim To be able to identify a specific ink. Context. Chromatography – this is a technique that can be used to separate colours in inks/paints, identify different inks/paints and can also be used to identify biological chemicals such as amino acids.

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Chromatography

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  1. Chromatography Aim To be able to identify a specific ink

  2. Context Chromatography – this is a technique that can be used to separate colours in inks/paints, identify different inks/paints and can also be used to identify biological chemicals such as amino acids. You will be given a sample of ink that was used to alter a cheque and several inks that may have used to change it. You have to match one of the inks to the ink that was used to alter the cheque.

  3. Risk Assessment

  4. Equipment Diagram

  5. Method • Draw a pencil line 1cm from the bottom of a piece of chromatography paper • Place a dot of each ink you are investigating (3cm apart) on the pencil line. • Roll the paper into a cylinder and secure with a paper clip. • Place the paper into a beaker that has about a ½ cm depth of solvent in it. • Leave to allow the solvent to move up the paper and when it is near the top remove and leave to dry

  6. Results

  7. Analysis Work out the Rf values for each part of the ink. This is done by using the following calculation: Rf= Distance travelled by the part of the ink  distance the solvent travelled The ink that was used to make the forgery was….. I know this because………..

  8. Evaluation My experiment went… I did not have problems with… because… I had problems with … because… To improve my experiment I could… My results would be more reliable if I… I liked this experiment because… I disliked this experiment because…

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