NMA to Orange

NMA, (Methyl-5-Norbornene-2,3-Dicarboxylic Anhydride)

C₁₀H₁₀O₃   F.W. 178.19   CAS #25134-21-8
Specific Gravity @20/20°C : 1.245
b.p. @ 10mm Hg : 140°C
An epoxy hardener

Nigrosin

(Acid Black 2; Gray R, B, BB; Indulin Black; Nigrosin W, WL ; Silver Gray; Steel Gray)
CAS #8005-03-06
Solubility: 10.0% Water; 0.0% Alcohol; 1.0% Cellosolve; 11.0% Glycol; 0.0% Xylene
For negative staining of bacteria. With Basic Fuchsin, staining bacteria spores. Dorner, Le Lait, 6, 8 (1926). Biochem. Biophys. Acta 69,159 (1963).

Nile Blue A

(Basic Blue 12, Nile Blue Sulfate)
(C₂₀H₂₀N₃O)₂SO₄   F.W. 732.84   CAS #3625-57-8

Solubility: 6.0% Water; 5.0% Alcohol; 5.0% Cellosolve; 5.0% Glycol; 0.25% Xylene.
Dye content: approx. 65%
Differentiates melamins and lipofuscins; Used in fat staining.
Lillie, Stain Tech., 31,151 (1956); J. Histochem., 4,377; Z. Anal. Chem. 260, 290 (1972).
For staining bone sections. Cytologia, 11, 261 (1940)

Ninhydrin, Crystal, Reagent

(1,2,3-Triketohydrindene Monohydrate)
C₉O₄·H₂O   F.W. 178.15   CAS #485-47-2

Nitro Blue Tetrazolium Chloride

(Nitro, BT, p-Nitrotetrazolium Blue; 2, 2´-Di-p-nitrophenyl-5, 5´diphenyl-[3, 3´-dimethoxy-4, 4´-diphenylene] ditetrazolium chloride)
C₄₀H₃₀Cl₂N₁₀O₆   F.W. 817.6   CAS 298-83-9 

Approx. 98% (TLC).
Contains up to 10% solvent. A substrate for dehydrogenases and other oxidases

Also available in tablet form. Tablet contains 10mg substrate per tablet.

Nitrocellulose

Please see Parlodion Purified Strips.

NSA, Nonenyl Succinic Anhydride

Specially Distilled EM Grade
F.W. 227   CAS #28928-97-4
b.p. 325°C
Viscosity: 102.8 at 25°C
Density: 1.08gm/cm³
An epoxy hardener specially distilled. The special distillation process offers you much clearer blocks than the standard NSA

Orange II

(Acid Orange 7; Acid Orange II, Y or A; Gold Orange; Mandarin G; Orange A, P or R; Orange Extra; Tropaoelin OOO No.2)
C₁₆H₁₁N₂O₄SNa   F.W. 350.33   CAS #633-96-5
Solubility: 3.0% Water; 0.15% Alcohol; 2.5% Cellosolve; 8.0% Glycol; 0.0% Xylene
Dye Content: approx. 75%

A general tissue stain with Eosin and Azur-C. French, Stain Tech., 1, 79 (1926). Counterstain for Heidenhain's Hematoxylin in animal histology. A substitute for Orange G if a stronger yellow is desired for contrast. J. Lab. Med., 28, 995 (1943)

Orange G, Certified, C.N. #DcO-13

(Acid Orange 10, Wood Orange 2G)
C₁₆H₁₀N₂O₇S₂Na₂   F.W.. 452.38   CAS #1936-15-8
Solubility: 8.0% Water; 0.22% Alcohol; 1.7% Cellosolve; 3.0% Glycol; 0.0% Xylene Dye Content: approx. 60%

Kornhauser's Quad stain for most elementary structures of tissues. Stain Tech., 18, 985 (1943) Mallory's tissue stain for connective tissue. Mallory, J. Exper. Med., 5,15 (1900). Used with safranin and tannic acid for showing shoot apex in plant tissue. Stain Tech., 18, 105 (1943).