Fe-ECR could be used for both cytological and histological samples, and was suitable for use in automated tissue stainers. ECR also is less expensive than hematoxylin. Hematoxylin still may be preferred as a nuclear counterstain for some immunostaining methods for which Fe-ECR mixtures probably are too acidic.

AR—The standard Macron Fine Chemicals™ grade of analytical reagents; suitable for laboratory and general use. ... AR (ACS) Primary Standard—An analytical reagent of exceptional purity that is specially manufactured for standardizing volumetric solutions and preparing reference standards.

Aluminon, the triammonium salt of aurintricarboxylic acid, is a dye often used to detect the presence of the aluminium ion in an aqueous solution. Aluminon forms a red complex salt in combination with Al3+. In addition to its use in qualitative inorganic analysis, aluminon has applications in pigment production.

ERIOCHROME CYANINE R AR Reagent for Aluminium