Because there are a lot of other methods to prepare such stain, well, mostly according to the manufacturer itself, but does every method provides the same observation?
Sorry, no practical experience but interested in the matter. Unfortunately you haven't defined what yo want to stain with WRIGHT-GIEMSA stain (blood, nuclei, etc. ) which would perhaps be interesting to know.
Due to the fact that you didn' receive a reply to your question so far (ok, only 7 views up to now) it may signalize that the technique(s) used in Labs are more/less standardised (and manufacturers of staining kits have to apply to standards, I guess) and nobody cares about possible differences in outcome due to different approaches in preparation of the dye solution as well as staining process proper. It may be advisable to do a fast Google search (if available), e.g. for
| Comparison of different Wright-Giemsa stain makings | (where I found some sources/articles which look interesting) or
| Comparison of different Wright-Giemsa stain make*| or
| Comparison of different Wright-Giemsa stain mak* on cell smear* |
in one resulting source ( Title: Making and Staining a Blood blood smear ) it is stated(p.5.): "Not all Giemsa stains are equal in quality . We are using BAKERs from VWR..... (cf. https://www.uvm.edu/~jschall/pdfs/techniques/bloodsmears.pdf)
Best wishes and good luck!
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