What goes wrong

It grained in the jar

On this page9

Graining Why the container is involved Separation Too hard in winter, too soft in summer Which is worse in a wide mouth Keep the batch record Why a tin behaves differently from a jar Test the batch in the container you will ship References

A poured solid sets once, in the container, in front of the customer’s eventual experience of it.

Graining

A grainy balm is a crystallization problem in the butter or the wax. It shows up days or weeks after pouring, which means a batch can pass inspection on the day and fail in the box.

Why the container is involved

The product sets in the jar, so the jar governs how fast it cools and how evenly. A heavy glass jar and a thin walled plastic one take the same batch to different places.

Separation

Oil at the surface of a butter or a cream is the emulsion or the suspension giving up. In a whipped product it often reads as the product having shrunk, because the volume drops at the same time.

Too hard in winter, too soft in summer

The ratio that sets the hold is tuned at the temperature you work at. A product shipped in July and a product shipped in January arrive at different consistencies out of the same batch.

Which is worse in a wide mouth

A balm that has softened and resolidified shows every bit of that history at the surface, and a wide mouth container shows the whole surface at once. The same batch in a narrow neck would never be seen.

Keep the batch record

Pour temperature, ambient temperature, the container used and the date. Graining that appears three weeks later cannot be diagnosed without those four numbers, and MoCRA gives you a reason to be keeping records anyway.

Why a tin behaves differently from a jar

A steel tin is thin and conducts heat away quickly; a glass jar is thick and holds it. The same balm poured at the same temperature into both sets at different rates, and the rate is what decides whether the butter crystallises coarsely or finely. Changing container is changing process, which is the opposite of how packaging is usually treated.

Test the batch in the container you will ship

A sample poured into a spare jar tells you about that jar. If the product ships in a 2 oz tin, the test has to be in a 2 oz tin, left somewhere warm for a week, and opened in front of somebody who has not been looking at it every day.

References

The Davis Pack Supply catalog, measured 17 October 2026. The grooming shelf is 803 rows: 320 containers and 483 closures, derived from four packaging archetypes across the eight leaves of this use case.

FDA, Modernization of Cosmetics Regulation Act of 2022 (MoCRA). Facility registration renewed every two years; product listing by the responsible person with annual updates; records supporting adequate safety substantiation derived from scientifically robust methods; serious adverse events reported within 15 business days, with new medical information received within one year reported within a further 15 business days. Certain small businesses are exempt from GMP, registration and listing, except for products that contact mucous membranes, are injected, are intended for internal use, or alter appearance for more than 24 hours. fda.gov

Written from the FD&C Act and 21 CFR parts 701 and 740, and from the catalog as it stood on 17 October 2026. Whether a particular product is a cosmetic or a drug turns on its claims and its ingredients, and that determination has consequences; nothing here substitutes for getting it right for a specific formula and a specific label.