a dark mark or stain made by ink, paint, dirt, etc.

a blot of ink

a procedure in which proteins or nucleic acids separated on a gel are transferred directly to an immobilizing medium for identification

dry (a wet surface or substance) using an absorbent material

Henry blotted the page

mark or stain (something)

dark patches of dirt blotted the grey dress

cover writing or pictures with ink or paint so that they cannot be seen

Mary dug her brush into black paint and blotted out her picture

transfer by means of a blot