100 Black is a slightly bluish black which will fit with Cool Grays. On the other hand, 110 Black is a bit reddish and we can say that it’s closer to “ink black” or “deep black” compared with 100, and will fit with the Neutral Grays. The blending amount of dyestuffs is greater in 100 Black and this is the main difference between two.
The difference between these two blacks is very subtle and these may not look different on your paper (but on some papers, they do).
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