The Zodiac Killer wrote 20+ letters to police using a marker pen/felt tip pen on all his correspondences. Despite these letters being nearly half a century old, I gather using the techniques you described, it would be possible to determine whether two or more of the letters were likely written using the same brand of pen.
This video is excellent for use with my high school Chemistry and Forensic students! Your explanation is detailed and easy to understand. Learning about your career is fascinating for students who are exploring possibilities and wondering how their interests will allow them to be a contributing member of society and earn income. I point out how your dedication and commitment contribute in important ways to the science of forensics. Thank you!
Q. In a document, if some blank part of it is written 20 years later... can that be aged and precisely declared ?? More precisely.... consider one agreement was signed by one person in 1960 and the second party kept his part blank for 20 years and then on the need of using it; signs it in 1980. Is it possible to prove that second party signed it later ?????
excelente gracias muy buena ti investigacion, me podrías dar las marcas de estos lapiceros de tinta gel para buscarlos en colombia. tengo bastante lapiceros en mi taller de Documentologia pero en realidad no se cual seria de tinta gel.
Is it possible to catch tempering in a note if write one line with a ballpoint today and wrote second line tomorrow with new ballpoint but with same company and same new ballpoint with same handwriting? Please answer it
It may be possible, yes, but it would depend upon a number of factors. By the same handwriting do you mean the same person has written the two separate entries? If so, it may be more difficult to distinguish between the two entries. If that person has either deliberately disguised their handwriting for some reason OR were under a different set of stressors when writing the two separate entries which may affect the appearance of their handwriting, it might be possible to suggest evidence of some form of tampering. In terms of differences between the two ballpoint pens made by the same company it would depend on two main factors. Namely, whether there were any physical or mechanical defects with either or both pens, which could manifest into differences in the physical appearance of the ink strokes on the paper. Using microscopy it may be possible to observe physical differences between the ink strokes made by the two different pens which could be attributed to such defects. Ideally, for this, it would be beneficial to have access to one or both pens to aid comparison of any physical defects and to demonstrate that two different pens have been used to compose the note. (1/2)
Alternatively, differences between the chemical composition of the ink contained within the two pens which might be detectable using techniques such as filtered light, thin layer chromatography or instrumental analytical techniques such as Raman Spectroscopy as described in my video. For this, access to the pens themselves is not necessary, as these techniques can be applied to the handwriting itself to detect such differences. If the pens are manufactured by the same company, it doesn’t necessarily mean they contain the same ink formulation. The two pens may have been manufactured at different times and therefore contain different ink formulations. Even if the two pens contained the same ink formulation, they may not contain ink made in the same batch. Subtle chemical differences exist between different batches of the same ink formulation. So although the ink may appear visually similar in terms of colour, they may exhibit chemical or physical differences when examined by the techniques mentioned. Such differences would provide evidence that two different pens have been used to compose the note, therefore suggesting tampering may have occurred. If you want to explore this further, I recommend the following book as a good starting point: “Scientific Examination of Documents - Methods and Techniques”, written by Ellen, Day and Davies and published by CRC Press. (2/2)
Thanks Graham for the video. I'm off to search more gems you might posted. Keep it up
The Zodiac Killer wrote 20+ letters to police using a marker pen/felt tip pen on all his correspondences. Despite these letters being nearly half a century old, I gather using the techniques you described, it would be possible to determine whether two or more of the letters were likely written using the same brand of pen.
This video is excellent for use with my high school Chemistry and Forensic students! Your explanation is detailed and easy to understand. Learning about your career is fascinating for students who are exploring possibilities and wondering how their interests will allow them to be a contributing member of society and earn income. I point out how your dedication and commitment contribute in important ways to the science of forensics. Thank you!
Thankyou Dena, I’m glad you and your students found the video interesting and helpful.
Excellent explanation! Thank you 😊
thanks a lot for helping me out in making my assignment
Basically TLC, LIBS and Raman Spectroscopy. Really cool to be a chemist sometimes
Q. In a document, if some blank part of it is written 20 years later... can that be aged and precisely declared ??
More precisely.... consider one agreement was signed by one person in 1960 and the second party kept his part blank for 20 years and then on the need of using it; signs it in 1980. Is it possible to prove that second party signed it later ?????
excelente gracias muy buena ti investigacion, me podrías dar las marcas de estos lapiceros de tinta gel para buscarlos en colombia. tengo bastante lapiceros en mi taller de Documentologia pero en realidad no se cual seria de tinta gel.
Thank you very much for the video. the explanation are very clear :) wish you found another way to exploring Gel Pen :) Success !
Shoutout to BHS
MLN. Haha
Wait, can yall see *when* something was written?
Maybe we *are* in the future. 🤔
🚶🏿♂️
Is it possible to catch tempering in a note if write one line with a ballpoint today and wrote second line tomorrow with new ballpoint but with same company and same new ballpoint with same handwriting? Please answer it
It may be possible, yes, but it would depend upon a number of factors.
By the same handwriting do you mean the same person has written the two separate entries? If so, it may be more difficult to distinguish between the two entries. If that person has either deliberately disguised their handwriting for some reason OR were under a different set of stressors when writing the two separate entries which may affect the appearance of their handwriting, it might be possible to suggest evidence of some form of tampering.
In terms of differences between the two ballpoint pens made by the same company it would depend on two main factors. Namely, whether there were any physical or mechanical defects with either or both pens, which could manifest into differences in the physical appearance of the ink strokes on the paper. Using microscopy it may be possible to observe physical differences between the ink strokes made by the two different pens which could be attributed to such defects. Ideally, for this, it would be beneficial to have access to one or both pens to aid comparison of any physical defects and to demonstrate that two different pens have been used to compose the note. (1/2)
Alternatively, differences between the chemical composition of the ink contained within the two pens which might be detectable using techniques such as filtered light, thin layer chromatography or instrumental analytical techniques such as Raman Spectroscopy as described in my video. For this, access to the pens themselves is not necessary, as these techniques can be applied to the handwriting itself to detect such differences. If the pens are manufactured by the same company, it doesn’t necessarily mean they contain the same ink formulation. The two pens may have been manufactured at different times and therefore contain different ink formulations. Even if the two pens contained the same ink formulation, they may not contain ink made in the same batch. Subtle chemical differences exist between different batches of the same ink formulation. So although the ink may appear visually similar in terms of colour, they may exhibit chemical or physical differences when examined by the techniques mentioned. Such differences would provide evidence that two different pens have been used to compose the note, therefore suggesting tampering may have occurred.
If you want to explore this further, I recommend the following book as a good starting point: “Scientific Examination of Documents - Methods and Techniques”, written by Ellen, Day and Davies and published by CRC Press. (2/2)
take me to moisty mires but not look lake
I want to contect you.
Is it possible ?
If it is possible then please give a source to talk you.