Not as dark as I thought.
I think this ink is just fine as an ink and as a pad. I definitely get the essence of a rainy day with this gray, but it sure is light in application. The contrast is very low (even on a white background) and I admit I was a little disappointed.
To compare, I ordered Wendy Vecchi's Make Art - Blendable Dye Ink Pad in "Watering Can." Watering Can is what I think of when I think of a medium gray ink. I did comparison stampings of the two inks: WC is darker than "Rainy Day," which comes off as a ghost impression of Watering Can.
You may want to order "Charcoal" if you're planning to use a Scrapbook.com gray ink that you want to contrast against other media in your work.