Editing Prussian blue (section)

===Turnbull's blue===
[[File:HexacyanidoferratIII 2.svg|thumb|200x200px|[[Ferricyanide]] ion, used to make Turnbull's blue|alt=]]
In former times, the addition of iron(II) salts to a solution of [[ferricyanide]] was thought to afford a material different from Prussian blue. The product was traditionally named Turnbull's blue (TB). [[X-ray diffraction]] and [[electron diffraction]] methods have shown, though, that the structures of PB and TB are identical.<ref>{{cite journal|doi=10.1021/ac00278a041|title=Photoacoustic spectra of prussian blue and photochemical reaction of ferric ferricyanide|year=1984|last1=Ozeki|first1=Toru.|last2=Matsumoto|first2=Koichi.|last3=Hikime|first3=Seiichiro.|journal=Analytical Chemistry|volume=56|issue=14|pages=2819}}</ref><ref>{{cite journal|doi=10.1021/ic50091a012|title=Calorimetric study of Prussian blue and Turnbull's blue formation|year=1970|last1=Izatt|first1=Reed M.|last2=Watt|first2=Gerald D.|last3=Bartholomew|first3=Calvin H.|last4=Christensen|first4=James J.|journal=Inorganic Chemistry|volume=9|issue=9|pages=2019|author-link1=Reed M. Izatt|url=https://digital.library.unt.edu/ark:/67531/metadc867411/|type=Submitted manuscript}}</ref> The differences in the colors for TB and PB reflect subtle differences in the methods of precipitation, which strongly affect particle size and impurity content.