The only developer of any practical importance is a solution of [beta]-naphthol in caustic soda, which produces primuline red.
The primulinecolours are best adapted for cotton dyeing, and the colours obtained are fast to washing and to moderate soaping, but they are not very fast to light.
The primuline colours were the first representatives of this class and are derived from the yellow dyestuff known as primuline, which dyes cotton in the same manner as the direct colours.
It is pretty certain, however, that nitrogen is set free, for if gelatine imbued with primuline be immersed in water after insulation, nitrogen is set free and can be collected as usual in a tub filled with water and inverted on the substance.
By itself diazotized primuline is slowly influenced by light, but quickly acted on in presence of organic substances.
The chemical change light effects in the diazotized primuline is not well known.
As said above, primuline is transformed by nitrous oxide into a diazotized compound, and consequently the material is now susceptible of being acted on by light.
In other words, the diazotized primuline acts as a mordant only when not altered by the luminous action.
Paper is impregnated with primuline either by floating or brushing.
Perhaps the best for our purpose is the primuline process, as various colored images can be produced, with but little trouble, on all kinds of material.
Under the influence of light, however, the diazotised primuline is decomposed with the loss of nitrogen, and the formation of a product which does not possess the properties of a diazo-compound.
Not only is primuline a dye, but it contains an amido-group which can be diazotised.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "primuline" in a variety of sentences. We hope that you will now be able to make sentences using this word.
