Chemical substance made in a laboratory. Other chemical substances commonly encountered in pure form are diamond (carbon), gold, table salt (sodium chloride) and refined sugar (sucrose). However, in practice, no substance is entirely pure, and chemical purity is specified according to the intended use of the chemical. Chemical substances exist as solids, liquids, gases, or plasma, and may change between these phases of matter with changes in temperature or pressure. Chemical substances may be combined or converted to others by means of chemical reactions. Forms of energy, such as light and heat, are not matter, and are thus not "substances" in this
What Time Is Love? "What Time Is Love?" was given international commercial releases on many occasions and in many forms between 1988 and 1992. The following lists detail most of these, but are not exhaustive. "What Time Is Love? (Pure Trance Original)" (catalogue number KLF 004T) was first released on 17 October 1988, and deleted following initially low UK media interest and sales. The reaction from continental Europe's clubbers and DJs led to further European releases in 1989 and 1990. In late 1989, a US edition of "Pure Trance 1" (sea-green writing on a black sleeve, and slightly different typography) was issued on the