trial
what were your instructions from the police
to examine the pens found at the scene and determine whether they were used to forge the bank note
did you report all your findings?
i did not report all the findings as some gave similar results, i only added some however i wrote all the findings in my lab notes
can you explain peer review process?
the peer review process is where a second examiner looks at your work to make sure it's all correct and this makes it more reliable
why did you use ftir
i used ftir as it provides information on the chemical structure of the ink which can then be compared to others
why did you use raman
raman provides the chemical structure of the ink and its a non destructive technique so the bank note can be used after
why did you use vsc?
i used vsc as it can show altercations that are not seen by the naked eye such as what was written under the obliteration
explain how ftir works
ftir works by shining infrared light through a sample and measuring how the sample absorbs or reflects it
explain how raman works
raman works by shining a laser through at sample and measuring how the light scatters
explain how vsc works
vsc works by capturing the visible and infrared light reflected by the document. its like a magnifying glass
limitation of ftir
difficult to detect non polar molecules
limitations of raman
can cause fluorescence
limitations of vsc
only used to differeciate and not identify
what further tests can be done?
thin paper chromatography can be used as it reveals the differences in the makeup which allows us to see what was originally written and what was later on added