Chemistry question - black blots and spots.

What needs to be applied to photographic paper so that after development there would be black in these places, in short, you need to make a black frame or black blots and spots on the image using a non-optical method.

Not a clue what you want to do but I'd think India ink applied with a ruling pen or brushes might do what you want. Or, are you talking about a chemical method of "exposure" where you treat the paper and it develops black in those areas? That should also be possible, though I'd have to look up what might be used.

I am talking about a chemical method of "exposure" where you treat the paper and it develops black in those areas

Before exposure or after exposure, apply the solution with a brush or spray gun and after development in these places there will be a black or gray glare effect depending on the concentration of the solution

This turns out to be a bit of a rabbit hole. I know mercury contamination will fog film easily, but that's a road you don't want to go down. Some color processes use a non-optical exposure. Some interesting but not terribly useful conversations here- Fogging Developer for Reversal

 

I would have thought there would be various chemicals that instantly "exposed" film, but have yet to find any references. Maybe somebody else here will have something obvious.

After exposure and development, apply Spotone. It will be laborious, but it should work for your spots. For a frame, it would be easier to mask off the part you did not want black and simply expose to white light from the enlarger for a minute or two.

E6 colour developer contains a chemical foggant. So the easiest way to do what you want is to use the colour developer out of an E6 kit - obviously not one that requires a light exposure between the 1st and 2nd developer.

 

I believe Tetenal's 'Colortec' E6 kit is one such that contains a chemical foggant in the colour dev.