Abstract
We present a review of the experimental aspects of research on the blue phases of chiral liquid crystals. First a general description of blue phases is given and their relation to other important condensed matter problems is mentioned. Experimental proof for the existence of blue phases is followed by a description of experiments relating to the structure of BPI and BPII and of the electric field-induced phases BPH and BPX. The remainder of the review is then devoted to the structure of BP III, which is still one of the outstanding problems of liquid crystal physics. A brief discussion of outstanding questions and new directions completes the review.

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