Here are the official rules from Mistress Elfwyn. The "usual" documentation for an art-sci entry is required:

Ingredients List:

1. Brass
2. Glass
3. Herbs
4. Oak
5. Sheep
6. Honey
7. Salt
8. Wine
9. Water
10. Bone

Rules:
• A qualifying entry must use at least 7 of the 10 ingredients in the
production of an entry
• The ingredients used must be either an actual ingredient in the project OR an integral requirement of the production (i.e., a grinding stone in an integral requirement of flour production, but the entrant must make the production tool)
• Ingredients may be used creatively (i.e., animal hide may be used as the entire hide, or either the fur or skin may be all that is used)
• In the case of a tie score, the entrant with the most ingredients used wins (should both artisans have the same number of ingredients used, the entry with the most ingredients used as actual ingredients in the project will win)

Prize:
The winner will receive a hand made basket from Mistress Elfwyn filled with SCA arts goodies