You can use this free image under the Creative Commons Zero (CC0) public domain license. Support our free section by adding a credit line next to the photo in your design. A suggestion is provided under the title.
sepia
I tried to tint some drawing paper in a bath of water and sepia ink. It didn't work, but at least I got this photo of the ink and water mixing.
© publicdomainstockphotos | Stock Free Images