This tub is 946 ml, which is a lot for a hair mask. How should I store it and how long will it stay fresh after opening?

Because this is a large-format tub, the practical concern is keeping the product stable until you finish it. Look for the open-jar symbol on the label; it tells you how long the product is intended to remain fine after opening. If the symbol is not visible, do not keep it indefinitely and instead use your senses: if the smell, colour or texture changes noticeably, stop using it.

Storage matters more with a big tub that stays open for months. Keep the lid closed after each use, store it away from direct sunlight and heat, and take the product out with clean, dry fingers or a spatula. Do not add water to the tub: water can change the texture and make the product more prone to bacterial growth.

This mask contains plant oils, including coconut oil, so warm, humid conditions can make the texture or smell less pleasant over time. Normal bathroom storage is acceptable for most people, but if your bathroom is very warm, a cooler cabinet or shelf is a better spot.