Which item is not a factor that determines friction between sliding surfaces?

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Friction between sliding surfaces is governed by the force pressing the surfaces together and the interaction properties of the contacting materials, often captured by the coefficient of friction. The normal force (how hard the surfaces are pressed) directly increases friction: more pressing force means more friction for both static and kinetic cases. The coefficient of friction is a material- and condition-dependent property that tells you how resistant the contact is to sliding for a given normal force. Temperature can change friction by altering material hardness, surface roughness, or lubricant viscosity, which in turn can raise or lower the effective coefficient of friction. The color of the surfaces, however, has no effect on these microscopic contact interactions, so it does not influence friction.