You will need:-
Black and white acrylic paint or drawing inks
An old paintbrush
Tub of water to thin your paint slightly
A sheet of white or black paper (your own preference and also based on what drawing you;ve already done)
Now of course if you are using white paint or drawing ink, you must have a solid black background on your art so that it shows up very effectively as a great spatter. And also vice versa for white backgrounds with black paint for ink splatters.
In the following video I run you through some of the ways that I introduce ink splatter to my drawings with white and black paint. The splatters will vary with each different tool as you'll see in the video, the Toothbrush creates the finest spray of paint and you could combine this with the paint brush method to vary the size of the ink blobs falling on your drawing.
Here's the link also - How to add ink splatter to your drawings to create depth
Remember, the thicker the paint and less watered down the paint, the brighter the white will show up. and also black paint or ink will show up darker too and not a grey colour.
I will look at other ways to create ink spatter as I bet there are some quite inventive ways to use this technique.