Figure 1.
Red wines on test coupons: Cu (middle), Al (right) and Cu/oxide coating (left). (a, b) drops of red wines at the beginning, (c) after 12 hours, and (d) after being run through water.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.