These are pretreated and laundered industrial stain monitors that Andrea used during detergent testing. The bottom-middle monitor shows stains pretreated and washed with Tide Free & Gentle.
Department of Physics, Umeå University, Umeå SE-901 87, Sweden Department of Physics, Umeå University, Umeå SE-901 87, Sweden Wallenberg Initiative Materials Science for Sustainability, Department of ...
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