| 摘要 |
A method of making a construction material luminous in response to ultraviolet rays. An inorganic material containing an ultraviolet luminous substance can be used as pigment after formed into gravelish, sandy or fragmentary material and, thus, a sufficient amount of luminance thereof can be ensured over long years while being prevented from deterioration with time of pigment. In particular, when using as inorganic materials ores containing ultraviolet luminous substance which is obtainable at a low price, pigment can be prepared at a low cost and patterned and decorated construction materials can also be manufactured at a low cost. Further, with the use of a large number of small pieces containing ultraviolet luminous substances as a pattern composing pieces, patterns complicated in shape and various in color can easily be produced on the surface of a construction material.
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