Culture Vial/Tube, Amber Glass

Quick Answer: The Culture Vial/Tube, Amber Glass is a culture vessel made of brown-tinted glass that screens out much of the ultraviolet and blue light. An amber glass culture tube is chosen when the medium, reagent or sample inside would be damaged by light during storage or incubation.

What Amber Glass Protects Against

Amber glass gets its colour from iron and sulphur compounds added to the melt, and it absorbs much of the light below roughly 450 nm, the ultraviolet and blue region that drives many photochemical reactions. Several substances used in biology labs break down in that light: riboflavin and some other vitamins in culture media, tetracycline and other light-sensitive antibiotics, many dyes and fluorescent stains, and silver nitrate. Kept in amber vessels, these preparations last longer and give more consistent results.

The trade-off is visibility. Turbidity, colour changes and colony growth are harder to judge through brown glass, so amber tubes suit storage and incubation of light-sensitive material rather than routine growth tests. In photobiology practicals they can also serve as a light-reduced vessel, although amber glass does not make a tube completely dark; wrapping in foil does that. The clear glass culture vial is the choice when growth must be seen.

Whether the glass is borosilicate, the size, base shape and closure are not stated in the listing. If the tube will be autoclaved or heated, find out its glass type first.

Specifications

Working With Amber Tubes

• Label each amber glass culture tube clearly on the outside, since contents cannot be identified by sight.
• Hold contents up to a strong light before use, or pour a little into a clear tube, to spot contamination or precipitate.
• Clean with laboratory detergent and a tube brush and rinse well; residues are harder to see in amber glass.
• Store filled tubes upright in a rack in a cool place, out of direct sunlight.

Applications

• Storing antibiotic, vitamin and hormone stock solutions for tissue and microbial culture
• Holding light-sensitive stains and indicator solutions at the bench
• Incubating cultures in media containing light-sensitive components
• Keeping small samples for chromatography or spectrophotometry away from light

Why Choose LabEquip

Microbiology, tissue culture and pharmacy labs keep a stock of amber vessels for reagents that degrade in light. LabEquip lists these in Biology Lab Products; ask about sizes and closures through the contact page.

Frequently Asked Questions

Why use amber glass for culture tubes?

Amber glass absorbs much of the ultraviolet and blue light that breaks down light-sensitive media components, antibiotics, vitamins and stains, so these last longer and give more consistent results.

Does amber glass block all light?

No. It filters short wavelengths strongly but still lets red and some green light through. For total darkness, wrap the tube in aluminium foil or keep it in a closed box.

Which lab materials are light-sensitive?

Examples include riboflavin and some other vitamins, tetracycline and other antibiotics, silver nitrate and many dyes and fluorescent stains.

Can I see bacterial growth through amber glass?

Only with difficulty. Turbidity, colour change and colonies are much harder to judge, so use clear glass when growth must be observed.

Can amber glass tubes be autoclaved?

Amber borosilicate glass generally tolerates autoclaving, while amber soda-lime glass is more likely to crack with heat. The listing does not name the glass type, so confirm it when you enquire.

How should amber tubes be stored?

Store them upright in a rack in a cool place, closed with caps or plugs, and label them clearly. Keep filled tubes out of direct sunlight even though the glass offers some protection.

Last Updated: September 2026