I'm not an expert, but the answer in advance, and then the experts will clarify or correct. In general, the schedule is really stored in museums in special rooms. Its only available at the time of exhibitions.
Paper afraid and dry air, and excessive moisture, watercolor, gouache - direct sunlight colors, pastels, too, in my opinion, can be burnt (but I think that you can protect them by putting under glass).
That's what rich, and so happy
