Molybdomancy is the Finnish New Year's Eve tradition of predicting the future by melting metal and examining its shape.
In the Finnish version, a small horseshoe-shaped piece traditionally made from tin is melted and poured into cold water. The resulting solid shape is interpreted symbolically, sometimes by looking at its shadow against a wall. The reading may suggest themes such as travel, work, relationships, or prosperity for the coming year.
The practice is a form of divination known by the Greek-derived term molybdomancy, referring to divination using molten metal. Finnish New Year customs have historically included this ritual alongside social gatherings, fireworks, and watching the clock reach midnight.
Safety and environmental concerns have affected the materials used. Traditional “tin” products may contain other metals, and molten metal can cause serious burns. Modern versions may use safer, certified materials or replace the activity with non-melting fortune games. The custom is cultural entertainment, not a scientific forecasting method.