I noticed over the years that girl’s manga are pretty much the one example where different colored ink is used for the art and i don´t mean accent colors only as these are more wildly used. (These were frankly more common in the 80s/90s).

The occasionally different and then mostly blue inking (variations as green are also common) only shows up in the first print magazine version of the tale and the format is then usually changed to the regular black in the tankōbon. Is there a deeper meaning behind the process as reverting to black in the end makes no sense to me.
A simple link that explains this practice would be enough as I haven´t found my answer on my own jet.

I also read EU/US comics and am a librarian.
Manga-Masters, My ANN-Lists + Imdb

Will this answer? http://comipress.com/article/2006/10/29/941
I hope I got what you mean right.

Haha. So the answer is that newspapers stock looks like trash (it does!) and they only want to smooth it over as anthology magazines are the cheapest thing on on earth.
The more you know. Thx.

Edit: This form of inking could become a dying "art form" soon enough i guess as the zasshi format can´t have that many years left in it before we go all digital on an industry wide scale. Well i won´t miss this nonsense.

I also read EU/US comics and am a librarian.
Manga-Masters, My ANN-Lists + Imdb