The C1005-SC5-OB is the opaque black light-protective sterile screw-cap variant in the C1005-T5 family — 500 sterile tubes in foam racks at $147 ($0.294 per tube). Opaque black tube material blocks ambient light — designed for light-sensitive samples: fluorescent dyes, photo-sensitive reagents, light-degradable compounds, photo-sensitive cell-imaging samples.
For full chemistry rationale, see the C1005-T5 Clear (C1005 family anchor) page and C1005-SC5-S (sterile clear sister) page.
Key Specifications
| SKU | C1005-SC5-OB |
| Type | 5 mL screw-cap tube, sterile, opaque black, in foam racks |
| Pack quantity | 500 tubes in foam racks |
| Per-tube cost | $0.294 (highest in C1005 family) |
| Tube color | Opaque black (light-blocking) |
| Sterility | Sterile |
| Cap configuration | Attached, in foam racks |
| List price | $147 |
Why Opaque Black — Light-Sensitive Sample Protection
Many laboratory samples are light-sensitive:
- Fluorescent dyes — fluorophores photobleach under ambient light, reducing assay signal
- Photo-sensitive reagents — reagents degrade under UV / visible light exposure
- Light-degradable compounds — pharmaceuticals / chemicals that degrade with light exposure
- Cell-imaging samples — samples loaded with fluorophores for downstream microscopy
Standard clear tubes expose contents to ambient light — incidental exposure during workflow handling can degrade samples. Opaque black tubes block light — protecting sample integrity during handling, storage, and transfer steps.
Pick the C1005-SC5-OB when:
- Workflow involves fluorescent dyes / fluorophores as samples or reagents
- Photo-sensitive reagent workflows — pharmaceutical chemistry, photo-degradation studies
- Cell-imaging sample storage — fluorophore-loaded cells before microscopy
- Light-sensitive analytical chemistry samples
Stay with clear sister tubes (C1005-SC5-S, $127) when sterility matters but light-protection doesn't — $20 saving when opaque black isn't required.
C1005 Tube Family — Tube Color / Sterility / Cap Comparison
| SKU | Color | Sterile | Cap config | List price |
| C1005-T5 Clear | Clear | Non-sterile | None included | $50 (200/pk) |
| C1005-SC5 | Clear | Non-sterile | Separate | $147.00 (500/pk) |
| C1005-SC5-S | Clear | Sterile | Attached, in rack | $127 (500/pk) |
| C1005-SC5-OB (this product) | Opaque black | Sterile | Attached, foam rack | $147 (500/pk) |
Application Profile
Fluorescent dye sample-prep — protein fluorescent labeling, fluorescent imaging-prep workflows.
Photo-sensitive reagent storage — pharmaceutical chemistry, photo-degradation kinetic studies.
Cell-imaging sample storage — fluorophore-loaded cell samples between processing and imaging.
Light-sensitive analytical chemistry — sample-prep for analytical methods with photo-degradation concerns.
Method-development workflows — protocol-development comparing photo-protection effects on assay signal.
Ordering & Configuration
Confirm sterility certification documentation if required.
Confirm at quote: light-sensitive workflow context, sterility certification, foam rack organization, and lead time.
Warranty: Per Benchmark Scientific standard consumable terms.
C1005 5 mL screw-cap tube family:
- C1005-SC5 — Non-sterile clear ($147.00)
- C1005-SC5-S — Sterile clear ($127)
- C1005-SC5-OB (this product) — Sterile opaque black ($147) — light-sensitive samples
Pick the opaque black sterile tube for light-sensitive sample workflows; sister clear sterile / non-sterile variants cover non-light-sensitive workflows. See C1005-T5 Clear anchor for full C1005 family detail.
