why brush multiplication mode doesn't work?

Question

hi does anyone have any idea why brush multiplication mode doesn't work?
It seemed to work fine before,
By the rules this mode should multiply the color of the selected paint in this example I select the background color neutral gray but the brush strokes appear chaotic and do not work to multiply the underlying layers.
I think I have a lot of experience in the application, but this is the first time I come across such a thing.
can anyone help?
Additional information the brush is standard.

thejanebradbury · Accepted Answer

that I understood (knew),So you can't paint on a blank layer in brush multiply mode?You can if you set the Brush in the Tool Options to Multiply, but it doesn't affect the underlying layer as changing the Blend Mode of the actual layer does. With the Brush set to Multiply you can paint on that same layer and each brush stroke will multiply with the brush strokes already made on that layer. So, you could in theory paint in a shadow this way by repeating brush strokes set to multiply until you reach your desired effect.

Jeff Arola · Answer

If you set the Mode of the Brush Tool in the Tool Options Bar to Multiply, then that only multiplies with pixels on the same layer and doesn't affect underlying layers.

If on the other hand you make a new blank layer, set the Layer Blending Mode to Multiply and paint on the layer then it does affect the underlying layers.

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