Monart. This was an art glass line produced by the Moncrieff glassworks, in Perth in Scotland. A family of Spanish glassblowers (Salvador Ysart, the father and his sons Paul, Antoine, Augustine and Vincent) were employed to make a range of decorative glass. Isobel, John's daughter in-law, was the inspiration for this line which represented a significant departure from the main production. The Ysart family had worked for a time at the Schneider facility and whilst they never copied Schneider production it is fair to say this influenced the glass they were to produce. Isobel designed many of the shapes. The colours and form of the best of Monart is exceptional, with dancing and swirling bands of colour created by clever use of enamels marvered into the glass. The use of inclusions such as mica flecks, bubbles crackle glass with rich vibrant colours are common place in their production. Subtle hues and rich colous were used in combination with crackle glass. This was re-heated at the glory hole to produce an iridescence. Early glass is sometimes found cracked internally due to stresses developed through insufficient annealing. Despite management changes and production ceasing during the Second World War, Monart continued in production with Paul Ysart until 1961 when art glass production ceased. Paul went on to work for Caithness. Salvador, Augustine and Vincent set-up Vasart glass in 1947.