I like the look of fibreskyn heads and would like one as a bass drum reso. Thing is I would like to maximise on the mottled look fibreskyns have and was wondering about staining it with coffee? I imagine putting the head flat on the floor, sprinkling it with instant coffee and then spraying water on it with one of those water sprayers you use on house plants. Any thoughts? Has anyone else tried staining drum heads?