That looks like sponged ink splattered with water to me. I'd sponge the darker blue ink in the centre, the lighter one at the edge of that "blob", splatter with water (flick it off the end of a paint brush), wait a few seconds then blot with a piece of kitchen paper or a tissue. Distress ink works brilliantly for this, other dye inks will work with varying degrees of success - try on a scrap first.
HTH!
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