The psychical researchers Eric Dingwall and Harry Price re-published an anonymous work written by a former medium entitled Revelations of a Spirit Medium (1922) which exposed the tricks of mediumship and the fraudulent methods of producing "spirit hands". Originally all the copies of the book were bought up by spiritualists and deliberately destroyed. In 1923, the magician Carlos María de Heredia revealed how fake spirit hands could be made by using a rubber glove, paraffin and a jar of cold water.
The first of these continued the tradition of individual practitioners, organised in circles centered on a medium and clients, without any hierarchy or dogma. Already by the late 19th century spiritualism had become increasingly syncretic, a natural development in a movement without central authority or dogma. Today, among these unorganised circles, spiritualism is similar to the new age movement. However, theosophy with its inclusion of Eastern religion, astrology, ritual magic and reincarnation is an example of a closer precursor of the 20th century new age movement. Today's syncretic spiritualists are quite heterogeneous in their beliefs regarding issues such as reincarnation or the existence of God. Some appropriate new age and neo-pagan beliefs, while others call themselves "Christian spiritualists", continuing with the tradition of cautiously incorporating spiritualist experiences into their Christian faith.
These employees, hired by psychic service companies who know they have no paranormal skills, usually fumble through a telephone session by asking the client numerous questions and providing generic answers to the client’s questions. Some callers get disgusted and hang up after several minutes, after paying a tidy per-minute sum to enrich the company.
The exposures of fraudulent activity led to a rapid decline in ectoplasm and materialization séances. Investigator Joe Nickell has written that modern self-proclaimed mediums like John Edward, Sylvia Browne, Rosemary Altea and James Van Praagh are avoiding the Victorian tradition of dark rooms, spirit handwriting and flying tambourines as these methods risk exposure. They instead use "mental mediumship" tactics like cold reading or gleaning information from sitters before hand (hot reading). Group readings also improve hits by making general statements with conviction, which will fit at least one person in the audience. Shows are carefully edited before airing to show only what appears to be hits and removing anything that does not reflect well on the medium.