Black Parker Quink Turns Yellow?

[Vendome]

I dug out my scribble pad that I use to test nibs, line widths and ink colours.

 

Looking at a few lines of writing in Washable Black Quink, the Fine nib of my 15/Jotter has held the colour really well, (looks nearly as good as the Waterman permanent black written with my Sheaffer 100). Whereas, on the Medium nib of a Vector, the ink has either faded, or gone to a funny looking black/brown antique hue.

[BoggBlot]

Since my last post on the subject I have spoken to a friend who was an industrial chemist specializing in paper production. He is of the opinion that the ink formula has been changed. The 'browning' is unlikely to have been caused by any paper(s) used. However, their are apparently a number of factors in the chemical formulation of the ink that could cause the problem. Phew!!

[GTOZack]

I was reading some articles about Sir Issac Newton. He obviously wrote a lot of problems and ideas.

he grew weary going into town and buying ink each week. He made his own ink compared to buying each vials or making your own quart of ink ( the man is also a frugal flicky type of shopper)

 

I located one of his not so common scribblings in his lab reports among this forum

behold i found one of the ink recipes he made.

I read along the line he scribbled out lines and wrote in ' too much copperas will cause the ink opt to turn yellow' written in 1689, Aged 46

SO i checked out what copperas is/was. Apparently, it is ferrous sulfate ( Iron Sulfate )

some gobs of the iron gall got stuck together chemically as it dried and will turn yellow on the paper.

so I assume you gotta shake the pen a bit better to disperse the copperas compound. or dilute it a bit more with similar color of ink.

 

just my two cent guys