| When extrusions of the highest quality are required, as in strong alloy aircraft parts, extrusion billets may be scalped before shipment to remove surface liquation. |
| Such liquation cakes should weigh up to three centumpondia, in each of which there is half an uncia of silver. |
| Fractional crystallization is usually important in plutonic rocks, whereas liquation can be significant in both plutonic and volcanic environments. |
