A colour standardised in 1934 from the colour of semi-translucent white glass. Opaline glass is also a decorative style of glass made in France from 1800 to the 1890s, though it reached its peak of popularity during the reign of Napoleon III in the 1850s and 1860s. The glass is opaque or slightly translucent, and can appear either white or brightly coloured in shades of green, blue, pink, black, lavender and yellow. The glass has a high lead content, which defined it as "demi-crystal" or semi-crystal. The primary influences on this style of glass were 16th century Venetian milk glass, and English white glass produced in 18th century Bristol.