Unbuffered formalin 1:5 is an aqueous dilution used in MCC’s reticulum stain. The reagents needed for the reticulum stain are:

Ferric ammonium sulfate, 3% w/v (cat # 5638A)
Unbuffered formalin diluted 1:5 (cat # 5730A)
Gold chloride, 0.1% w/v (cat # 5965A)
Nuclear fast red, 1% w/v (680A)
Potassium metabisulfite, 3% w/v (cat # 7460A)
Potassium permanganate, 1% w/v (cat # 7860A)
Silver nitrate, 10% w/v (8060A)
Sodium hydroxide, 3% w/v (cat # 8370A)
Sodium thiosulfate, 5% w/v (cat # 8775A)

All reagents are available individually and as a 4 oz. kit containing all the reagents (Cat # 806A-KIT-4OZ). All reagents are manufactured in the United States by Medical Chemical Corp.