Diesel tank filter gone green

[DAKA]

From Google;-

Scheele's Green was a colouring pigment that had been used in fabrics and wallpapers from about 1770. It was named after the Swedish chemist Scheele who invented it. The pigment was easy to make and was a bright green colour but under certain circumstances the copper arsenite could be deadly. Gosio discovered that if wallpaper containing Scheele's Green became damp and then became mouldy, the mould could carry out a chemical process to get rid of the copper arsenite. It converted it to a vapour form of arsenic, normally a mixture of arsine, dimethyl and trimethyl arsine which was very poisonous. If Napoleon's wallpaper had been green, it could possibly have contained arsenic, and this could have been the source of the arsenic in the hair sample. Napoleon might have been an early victim of Gosio's disease.

thanks for going to all that trouble
It makes sense now, while in a museum I was studding a sample of green wall paper supposed to be from Napoleon's bedroom , behind glass as it was considered toxic .

 

[Davegriff]

From Google;-

Scheele's Green was a colouring pigment that had been used in fabrics and wallpapers from about 1770. It was named after the Swedish chemist Scheele who invented it. The pigment was easy to make and was a bright green colour but under certain circumstances the copper arsenite could be deadly. Gosio discovered that if wallpaper containing Scheele's Green became damp and then became mouldy, the mould could carry out a chemical process to get rid of the copper arsenite. It converted it to a vapour form of arsenic, normally a mixture of arsine, dimethyl and trimethyl arsine which was very poisonous. If Napoleon's wallpaper had been green, it could possibly have contained arsenic, and this could have been the source of the arsenic in the hair sample. Napoleon might have been an early victim of Gosio's disease.

Or Paris green.......

From the net.....
"Paris green, also called Schweinfurt green, an extremely poisonous, bright green powder that was formerly used extensively as a pigment (e.g., in wallpaper) and that is sometimes used as an insecticide or to kill plant fungi; it must be used with great caution because of its poisonous nature. Chemically it is a copper acetoarsenite that may be prepared from arsenic trioxide and copper acetate."