I agree with most of the suggestions being made and the basic concept is coming along, but I'm still struggling with the depiction of the ink blot. When I think of spilled ink or any liquid on a flat surface, I think of a slick, fairly consistently shaded moving object illustrating its thickness and liquidity.
how are any of these new attempts going to fit on the nib of a pen ??
Ok, so I did what you suggested and came up with what I think are three realistic ink blots. Your representation of a "dried" ink blot doesn't look like any of these.
Just like everyone else, I'm attempting to help by making observations and offering suggestions on how to make your design more effective. I'm not here to quibble over dry vs. wet ink blots, how ink soaks into different kinds of paper differently, etc.
My basic premise is that if I'm using a symbol to illustrate a concept or evoke an image in the end user's mind, I'm rendering it accurately unless I'm attempting to only "suggest" the symbol and provoke the end user to fill in the image gaps in their mind.
That splotch looks like it was made with watercolor paint on a coarse, open weave paper or watercolor block which will absorb all the water first and that sponging action will pull the pigment towards the edges as it dries.
When I think of "ink" from a fountain pen, I think black opaque or a nearly opaque liquid.
I don't know... Sorry, I might be the only one who doesn't think the ink blot you've created works that well.