Premium
The use of a natural dye in the formation of a thin coloured coating on an aluminium surface
Author(s) -
TsangarakiKaplanoglou I,
Moshohoritou R,
KallithrakasKontos N
Publication year - 1989
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1989.tb01201.x
Subject(s) - aluminium , coating , anodizing , aqueous solution , chemistry , metallurgy , tin , electrolyte , materials science , electrode , composite material , organic chemistry
This paper describes a novel method for the electrolytic colouring of unanodised aluminium. The clean metal is treated using an alternating current in an aqueous bath containing tin(II) sulphate and the natural colouring matter crocin, the digentobiose ester of crocetin. This coating has a bright grey‐greenish‐yellow colour about 3 μm thick and is suitable for decorative purposes. If the aluminium has been anodised the coating cannot be formed.