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Triiodide derivatization and combinatorial counter-ion replacement: two methods for enhancing phasing signal using laboratory Cu K X-ray equipment Gwyndaf Evans and Gérard Bricogne Copyright © International Union of Crystallography Author(s) of this paper may load this reprint on their own web site provided that this cover page is retained. Republication of this article or its storage in electronic databases or the like is not permitted without prior permission in writing from the IUCr. Acta Cryst. (2002). D58, 976–991 Evans & Bricogne Triiodide derivatization and combinatorial counter-ion replacement research papers 976 Evans & Bricogne Triiodide derivatization and combinatorial counter-ion replacement Acta Cryst. (2002). D58, 976±99