Art can be made of almost anything, including substances 【M1】______ that have not been produced and used in ages, and it comes in all shapes and sizes. More importantly, scientists have to study art without affecting it, 【M2】______ and that usually means limited, destructive tests. 【M3】______ If they have to take a sample, it must be as small as possible. In the objects conservation lab, the big samples look as the period at the end of this sentence. 【M4】______ Small samples are microscopic. The scientists have developed creative ways to deal the constraints. Consider the case of the fish pendant. 【M5】______ Gold with multicolored enamel, it was originally thought to date in the 16th century.【M6】______ And curators and conservators saw that the style. was all wrong for that period. 【M7】______ It was either mislabeled or a pretence. Mark Wypyski, a glass specialist who runs【M8】______ the scanning electron microscope at the museum, took a tiny porcelainlike sample from a green part of the pendant and bombarded it with electrons, causing it to emit X-rays characteristic of the elements in it. Mr. Wypyski interpreted the results as they popped on a computer monitor. 【M9】______ There was chromium, which was not used in glass or enamels since the'19th century. 【M10】______ 【M1】