Can Fetid Heath produce two black, two white or one black/ one white mana from itself if it somehow could produce its own white/ black mana?

For instance if Fetid Heath was down and a Urborg, Tomb of Yawgmoth was down. Could a Fetid Heath use it’s own black mana that it can now produce from Urborg, Tomb of Yawgmoth to produce either combination of two mana types? Since it produces colorless mana when tapped without a white or black, could it produce two... show more For instance if Fetid Heath was down and a Urborg, Tomb of Yawgmoth was down. Could a Fetid Heath use it’s own black mana that it can now produce from Urborg, Tomb of Yawgmoth to produce either combination of two mana types? Since it produces colorless mana when tapped without a white or black, could it produce two mana of either combination merely using its own black mana?
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