Does this dye bleed like semi-permanents?

It does not bleed like a direct dye does. If you put it over dark hair, it might appear to be bleeding out, but it's just washing off the parts that it can't penetrate on the first wash. It is a permanent dye on light, pre-lightened, and grey hair.

will this work on dirty blonde hair? And can you mix two colors together, and do you have to lighten your hair?

Yes, you can definitely mix the colors. It worked on my black hair without pre-lightening. The colors are more subtle the darker your hair.

What would happen if I used it with 30 volume developer?

The higher the volume with this shade, the darker the hair will come out. It also depends on what hair color you started out with. Check out this post. It explains a lot. https://bellatory.com/hair/DIY-Hair-What-Is-Developer-and-How-Do-You-Use-It

Manufacturer	Clairol Professional
Item model number	99240004928
Product Dimensions	3.99 x 3 x 15.01 cm; 56.7 g
ASIN	B07SCYJ3KN

Clairol Professional Flare Me Hair Color Dark, 1n Bring It Onyx, 2 oz

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