Gold Dust

In Majora's Mask, Gold Dust is awarded to the victor of the Goron Races after completing Snowhead Temple. The Snowhead Blacksmiths need this to temper Link's Razor Sword into the Gilded Sword. Gold Dust can be sold for 200 Rupees at the Curiosity Shop, making it one of the most financially profitable items to sell. This is in stark contrast to the abysmal 40 rupees offered at the Mountain Smithy.

The Gold Dust comes in a bottle Link can keep the first time he wins it. The bottle, but not the dust, is brought back through time with him when travelling back to dawn of the first day. When gold dust is won again in future cycles, it is presented to Link on a piece of paper or foil, to be stored in a bottle he already possesses.