Disorders that could well be avoided

Metallic casse Metallic taste and haze, wine turns brown. Discard immediately as it is slightly poisonous and has a cumulative effect. Probable cause is the use of iron, copper, chipped enamel or lead-glazed stone containers.

Oxidasic casse Wine turns brown with almond smell.

1. take two glasses of wine, one treated with sulphite (one Campden tablet) and one untreated, and expose to air overnight. The untreated wine will darken.
2. Critic acid will not affect the rate of browning.