The solution of ferric alum (ferric ammonium sulfate) tends to be cloudy,
you can filter it, but have the idea this solution is only for
sensibilization purposes (please excuse my horrible english), and will not
well (not more than a week). Think you are trying to do a Gordon-Sweet
method,which is a double impregnation technique,so it demonstrates collagen
type I as well as reticulin(collagen type III).
I suggest you to make first a simple impregnation method like Wilder=B4s , it
is simple and introduces you to the study only of reticulin fibers.
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