How generate dark ,grainy spots in light areas on paper during development

Hi all

Imagine a pretty dark background with a pretty white subject on the foreground. For example an animal.

My aim during development of photo, is to generate very dark spots now only on the subject which is already light.

But these spots should have the character of being grainy. So not by adding a liquid on that moment, because liquid is not grainy and rough and could even create small drops which i don't like.

It should make a grainy inversion of white to black. So i thought it should be a chemical in powder , not liquid..?

Any ideas welcome.

Thank you.

Lots of ways to generate grain on film -- Google "grain" for example

You can use developers that are innately "grainy" (high-speed developers), you can make the temperature of the developer the wrong temperature (too hot) and so on

Here's praise of grain from the way-back times

Modern Photography 1948-10

Of course, you can always go digital and use some effects program to add grain, etc.

I know this, for sure;)

Different grain sizes via post work