Check the listing for details. Hematoxylin (Natural Black 1) (C.I. 75290), for Microscopy, 75+%, 5g. Condition: New. Listed at 43.95 USD. Hematoxylin (Natural Black 1) (C.I. 75290), 75+% (Dye Content), 5g For Research & Development Not for drug, human, animal, or food use Specifications: Appearance (Color) Pale beige to tan Appearance (Form) Powder Dye Content 75+% Grade - BSC Certified Harris alum hematoxylin vs Eosin Y - Satisfactory Mayers alum hematoxylin vs Eosin Y - Satisfactory Weigerts iron mordant hematoxylin staining - Satisfactory Heidenhains regressive hematoxylin staining - Satisfactory Peak 523nm, ratio 0.98 @ 508/538 nm Density @ peak 0.498 au CAS: 517-28-2 FORMULA: C16H14O6 · xH2O This item will be shipped in accordance with FedEx/UPS carriers, per DOT 49CFR regulations, which will meet or exceed all of USPS regulations per 49CFR 172.101, published in Federal Register 10742. Note: eBay please do not delist.