how to blend two or more materials?

Do it with a lerp node.

red -> connect your whole string from the first material with A and the string from the 2nd material with B
green -> Here you can add a mask, constant vector (0 = it just shows the first material, 1 = it just shows the 2nd material, 0.5/0.2/0.8/… = mix between both,…)

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