Concrete vessels need a low pour temp
Cured concrete fractures under thermal shock and the cracks can be invisible until the next burn. Drop the pour temperature to sixty-five degrees Celsius or lower and pre-warm the vessel to room temperature.
What this means for your recipe
When this rule fires the recipe is Blocked. The numeric score is hidden — a single Danger collapses the band on its own. Resolve the underlying condition before pouring or selling. The same rule fires every time the underlying condition is true, so the way to lift the score is to change the recipe, not the rule.
Primary sources
This rule is editorial. It reflects working chandler practice rather than a single primary regulation. See the related guides for the background.
Editorial content, not legal advice. Verify against the current text of the regulation before commercial sale.