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Different Color In The Last Bit Of Ink Sitting At The Bottom Of A Bottle?

ink iroshizuku

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#1 rdugar

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Posted 01 November 2019 - 01:04

I've had this bottle of Iroshizuku Ku-Jaku for about 8-9 years. Finally getting to the bottom of the bottle. Noticing that the color is quite different on paper than it was a few fills ago. It's bluer and darker, even in the same pen. I know the original color used to dry to a greenish blue - Pelikan M605 Medium nib on Staples sugarcane paper.

 

Why? Is it because the ink at the bottom wasn't shaken or stirred, and somehow, the bluer color was heavier? I didn't notice anything, but frankly never looked and it's a dark ink anyway.

 

I've forgotten my high school chemistry, but if it's a dye based ink, why would it do that?

 

I don't use much ink, so each bottle lasts for years.

 

Anyone else have this happen to them with a bottle?


Edited by rdugar, 01 November 2019 - 19:22.


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#2 DonM

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Posted 01 November 2019 - 19:24

Short answer is evaporation.  Happens with plastic cartridges, too.  Makes the ink more dense.







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