Bath curse tablets the Romans as "Aquae Sulis") were excavated between 1978 and 1983 by a team led by Barry Cunliffe and Peter Davenport. In 1979/1980, around 130 tablets were discovered in an excavation of the "Sacred Spring" under the King's Bath. The spring had been temporarily diverted to facilitate the excavation, revealing a huge array of Roman era items including the tablets. The tablets, some in a fragmentary state, were small and rectangular and initially were assumed to be made of lead, although subsequent metallurgical analysis revealed that they are, in fact, made of lead alloyed with tin, with occasional traces of
Aphanizomenon flos-aquae samples exceeded the safety value of 1 µg microcystin per gram. University professor Daniel Dietrich warned parents not to let children consume "A. flos-aquae" products, since children are even more vulnerable to toxic effects, due to lower body weight, and the continuous intake might lead to accumulation of toxins. Dietrich also warned against quackery schemes selling these cyanobacteria as medicine against illnesses such as attention deficit hyperactivity disorder, causing people to omit their regular drugs. A Canadian study studying the effect of "A. flos-aquae" on the immune and endocrine systems, as well as on general blood physiology, found that eating