Examine the table and place the SILVER IDENTIFIER and the 5 SILVER ITEMS on it (K).
You will trigger a puzzle.
Select the dropper (O) twice to fill it and use it on the items.
Place the silver items and weights on the skull scales to get the weight of each. See screenshot for matching weights and items.
You will earn PURE SILVER ITEMS.
Back out of close-up.
Examine the furnace and zoom into the bellows. Take the 3rd bestiary scroll and use the NEEDLE on the bellows (P).
Place the FIREWOOD under the pan and light with the MATCHES (Q).
Place the VALVE on the stem; turn the VALVE (R).
Place the PURE SILVER ITEMS in the pans (S) and use the bellows.
Use the TONGS on the melted silver; take the MIRROR (T).
Examine the eye; take the 3rd CROSS (U).
Back out twice and go up the ladder.