The Calcofluor White Stain, cataloged under National Stock Number 6550-01-735-9330, is classified within Federal Supply Class 6550 (In Vitro Diagnostic Substances, Reagents, Test Kits and Sets) of the Medical, Dental, and Veterinary Equipment group. The manufacturer of record is Thermo Fisher Scientific (asheville) Llc Div Laboratory Products Division. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: PG.
| Parameter | Value |
|---|---|
| NSN | 6550-01-735-9330 |
| Primary Part Number | R21507 |
| Item Name | Calcofluor White Stain |
| FSC / FSG | 6550 / 65 — In Vitro Diagnostic Substances, Reagents, Test Kits and Sets |
| Manufacturer | Thermo Fisher Scientific (asheville) Llc Div Laboratory Products Division |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Unit of Issue | PG |
| Part Number | Manufacturer |
|---|---|
| R21507 | Fisher Scientific Company L.l.c. Dba Thermofisher Scientific (USA) |
| R21507 PRIMARY | Thermo Fisher Scientific (asheville) Llc Div Laboratory Products Division (USA) |
| Reference | Meaning |
|---|---|
| 1707056 | 5/1 Secondary reference U.S. Government activity |
| 6550NCM252133 | 5/1 Secondary reference Defense Medical Standardization Board |
NSN 6550-01-735-9330 is a Calcofluor White Stain, manufactured by Thermo Fisher Scientific (asheville) Llc Div Laboratory Products Division, classified under FSC 6550, In Vitro Diagnostic Substances, Reagents, Test Kits and Sets. Status: active.
NSN 6550-01-735-9330 has 2 manufacturer part numbers on file: R21507 (Fisher Scientific Company L.l.c. Dba Thermofisher Scientific), R21507 (Thermo Fisher Scientific (asheville) Llc Div Laboratory Products Division).
Key specifications for R21507: Special Features: CALCOFLUOR WHITE IS A RAPID, NON-SPECIFIC, FLUOROCHROME STAIN USED IN MICROSCOPIC DETECTION OF FUNGI, YEASTS, ACANTHAMOEBA CYSTS, MICROSPORIDIA, AND PNEUMOCYSTIS CARINII IN CLINICAL SPECIMENS. RECENTLY CALCOFLUOR WHITE HAS BEEN USED TO DETECT FUNGI IN DIRECT PREPARATIONS AND IN DEPARAFFINIZED TISSUE SECTIONS6,7. CFW IS A CHEMOFLUORESCENT OPTICAL BRIGHTENING AGENT THAT HAS THE ABILITY TO BIND WITH CELLULOSE AND CHITIN. TYPE: CALCOFLUOR WHITE STAIN QUANTITY: 50 PK. VOLUME (METRIC): 0.75 ML AMPULE; Part Name Assigned by Controlling Agency: REAGENT DROPPER CALCOFLUOR WHITE 0.75 ML AMPULE 50 PK. 0 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.