The present invention is directed to a hair coloring method by using a composition comprising a specified ring-fused heterocycle direct dyestuff having the general formula or a salt thereof wherein the formulas are as defined in the patent claims. The local patient monitor may display a plurality of physiological parameters for a local patient. Methods of powering a firearm accessory are provided that can include providing a power source within a grip of the firearm; and powering the firearm accessory with the power source. This increased ease of vertical deflection tends to reduce the horizontal contact force component responsible for the scrub motion, thereby decreasing scrub length. The role of the mode and clock signals on the modeclock and clockmode signals, or their reversal, selects one or the other of the data communication circuits. In one aspect, the invention features a fuel source for a fuel cell, including a housing made substantially from a fuel-permeable material, and a fuel in the housing.