Mitchell's
Alum Hematoxylin

Mitchell's formula is from 1883 and is now obsolete. It does, however, show how alum hematoxylin solutions were originally prepared, and the variability inherent in the procedures for doing so. The modern formula should stain satisfactorily.

Original Amount Function
Logwood, ground 2 ounces Dye
Potassium alum 9 ounces Mordant
Distilled water as needed Solvent
Glycerol 4 fl. ounces Stabiliser
 
Modern Amount Function
Hematoxylin 3 g Dye
Potassium alum 35 g Mordant
Distilled water 340 mL Solvent
Glycerol 115 mL Stabiliser

 

Compounding procedure

Original
Moisten the ground logwood with water and pack it into a funnel.
Pour water onto the wood until it comes through barely coloured.
Remove the wood from the funnel, spread out and dry.
Dissolve the alum in 8 fluid oz of water.
Moisten the logwood with some alum water and pack it tightly into the funnel.
Pour the rest of the alum solution onto the logwood.
When the first drops come through, seal up the tip of the funnel.
Leave 48 hours for the dye to be extracted.
Remove the seal and collect the fluid that comes through.
Pour on more water until 12 fluid oz have been collected.
Add the glycerol, mix well and filter.

Modern
Dissolve the alum in the water.
Add the hematoxylin and mix until dissolved.
Add the glycerol, mix well and filter.

Method

  1. Bring sections to water with xylene and ethanol.
  2. Place into the staining solution for a few minutes, or
    dilute 1:7 with distilled water and stain overnight.
  3. Rinse with water and blue.
  4. Rinse well with water.
  5. Counterstain if desired.
  6. Dehydrate with ethanol, clear with xylene and mount with a resinous medium.

Expected results

Notes

  1. The staining characteristics were not given, but it is likely progressive, especially when diluted. If overstaining does occur, differentiate with 0.5 - 1% hydrochloric acid in 70% ethanol.
  2. The reason for the pre-wash of the logwood in water during the original preparation method was stated to be for the removal of tannin.
  3. The amount of hematoxylin in the modern formula is based on the fact that logwood contains up to 10% of the dye. Two ounces (about 57g) could contain a maximum of about 6 grams of dye. I have allowed for a 50% extraction, or 3 grams hematoxylin. It could well have been more or less than this.
  4. The original formula gives 255 grams of potassium alum to dissolve in 227 mL water. It takes just over 7 mL water to dissolve 1 gram crystalline potassium alum, so the amount of water specified would be able to dissolve only about 32 grams.
  5. Blueing is done with alkaline solutions such as hard tap water, Scott’s tap water substitute, 0.1% ammonia water, 1% aqueous sodium acetate, 0.5% aqueous lithium carbonate etc.

 

Reference
Arthur Bolles-Lee, (1885)
The Microtomist's Vade-Mecum
Originally published by: J & A Churchill, London, England.
Republished by: Science Heritage Ltd., Lincolnwood, Illinois, USA.

Susan Budavari, Editor, (1996)
The Merck Index, Ed. 12
Merck & Co., Inc., Whitehouse Station, NJ, USA

Lemmens, R. H. M. J. and Wulijarna-Soetjipto, N., Editors. (1992)
Plant resources of South East Asia No. 3, Dye and tannin-producing plants.
PROSEA, Bogor, Indonesia.

 


 

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