If you glaze fired to a hotter temperature than the bisque, it is possible that more carbon would burn out during glaze firing, causing blisters in the glaze which would not have time to heal over. For some clays this is not a problem. The carbon content in the clay is low or burns out early.
Catecholamines are derived from the amino acid tyrosine, which is derived from dietary sources as well as synthesis of phenylalanine. Catecholamines are water-soluble and are 50%-bound to plasma proteins in circulation.
WHAT IS METH MADE FROM? Methamphetamine is a synthetic (man-made) chemical, unlike cocaine, for instance, which comes from a plant. Meth is commonly manufactured in illegal, hidden laboratories, mixing various forms of amphetamine (another stimulant drug) or derivatives with other chemicals to boost its potency.