Green Glass Bottle, Black Cap, 100 ml

A ready-made set of a green glass medicine bottle, 100 ml and a black plastic cap with an 18/410 neck finish. The bottle has a narrow neck and straight walls, and it suits liquid preparations that are poured or measured out: facial and hair oils, serums, toners, herbal tinctures, blends of essential oils in a carrier oil, and massage oils. Green glass filters out some of the light reaching the contents, while still letting you see the level, so it is clear how much product is left.

The cap closes and seals the contents; it does not dispense. The set is therefore suited to preparations that are poured from the bottle, decanted into smaller containers, or taken out with a separate dropper. Both the bottle and the cap are declared suitable for contact with cosmetics. The set is not declared suitable for contact with food, so please use it for cosmetic purposes only.

Key features of the set

• Green glass – filters out some of the light and so slows down changes in the contents that light causes. For very light-sensitive ingredients, we still recommend storing the bottle in the dark, as only an opaque container gives full protection from light.
• Glass does not absorb fragrances or dyes – after washing, the bottle can be used again with no odour left from the previous contents. It is also suitable for essential oils and alcohol-based tinctures, which put plastic packaging under strain during longer contact.
• PP cap with a foam liner – the foamed polyethylene liner sits against the neck and seals the contents even when the cap is simply closed by hand in the usual way. When storing blends with a high proportion of essential oils for a longer time, we recommend checking the condition of the liner regularly.
• 18/410 neck finish – a common cosmetic thread. The cap can later be replaced with another closure of the same neck type, for example when moving from production to dispensing for customers.

Filling and volume

The nominal volume is the amount the bottle is designed to hold under normal filling. The brimful capacity, that is the physical volume up to the neck, is slightly larger, and you will find it in the parameters. The difference between the two values is a reserve for the cap, a dropper or a sprayer if used, and for the expansion of the contents when the temperature changes. Therefore, fill the bottle to the nominal volume, not to the brim. If it is overfilled, part of the contents is pushed onto the thread when closing and the cap does not seal.

Good to know

Before the first filling, wash the bottle and the cap in warm water with washing-up liquid, rinse them thoroughly and disinfect the inside with isopropyl alcohol or ethanol. Let both parts dry completely before filling. Residual water in an oil-based preparation shortens its stability, and in a tincture it changes the concentration.

Glass does not tolerate a sudden change in temperature well. Let a hot oil extract or a freshly strained macerated oil cool first, at least to a temperature at which the container can be held in the hand, and only then pour it into the bottle. Likewise, do not pour cold contents into a bottle that has just been taken out of hot water.

With repeated use, the cap wears out sooner than the glass. If it no longer closes without resistance or the liner has changed shape, replace it with a new one with an 18/410 neck finish. You will find closures for this neck and other ready-made bottle and closure combinations in the Handymade range. If you combine parts yourself, we recommend checking the seal with your specific formulation.

Frequently asked questions