Charge before you need them, not hours before. The clock starts the moment charging stops. Charge at dusk, not at noon, if you want maximum brightness at midnight. Use direct, unfiltered light. Ten minutes outdoors beats two hours behind a window. Spread them out. Pieces piled in a jar shade each other. Lay them in a single layer on a white or light-coloured tray, which reflects light back onto the sides. Turn them over. Halfway through charging, flip each piece so light reaches the underside. Wipe them clean first. Dust...
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The single biggest factor is not the pigment — it is how dark the room is. A resin animal figurine in a bedroom with a streetlight outside and a phone charger LED nearby will look far weaker than the same piece in a closed cupboard or a shaded garden corner.
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