How to change transparency of a Color3?

[AstroStudioz]

How would i go about changing he transparency of this color?

toolbar["Slot" .. tostring(slotNum)].Amount.Visible = false
				toolbar["Slot" .. tostring(slotNum)].Image = ""
				toolbar["Slot" .. tostring(slotNum)].Text.Visible = false
				toolbar["Slot" .. tostring(slotNum)].BackgroundColor3 = Color3.fromRGB(255, 170, 127)
			end
		end
	end

[fares14213]

toolbar[“Slot” … tostring(slotNum)].BackgroundTransparency = 0.5

Between 0 and 1