Antonia Ji..
I agree.
Previously attempts were made to study the ink - its consistency, colour, paper quality, handwriting etc in Mnuscripts, example the Kartarpuri Bir was studied by experts in this manner.
Later even the Language/vocabulary/grammatical evidence/certain phrases..etc were also used to arrive at conclusions. This is how the various handwritten manuscripts of the dsm granth were found to contain "English derivative words"....rasing the question whether the author (Guru Ji) also knew English ?? or is thsi proof of later writing wehn English words were common enough.
The Fallacious Bhai Gurdass the II Vaar 41 was also "found out" through the study of the language/and subject matter..
Bhai Bala janamsakhi has been found to contain English derived words...somethign a so called Bhai bala accompanying Bhai Mardana and Guru NANAK JI in the 15th century COULDNT be USING..it is definitley a 17th century production written by the Hindalis to discredit Guru NanaK Ji.
The infamous "letter of Bhai mani Singh to Mata Sundri ji" is another case in point....
Now that we also have Carbon Dating technology..Manuscripts real age can be found easily..
BUT then again MODERN FORGERS also have the best inks/paper aging technology/tech to forge handwriting etc at their command as well...especailly when you have the "real Manuscript" and only need to adulterate a few things ( This is why Most of the Manuscripts "lost" in 1984 from the Sikh ref Library ) pose a threat....with such expertise and 24 years ( still counting) to do a good job..anything can surface...whatever the "Forger" decides needs surfacing...