Concept:
Glazing is the process of fusing a glassy coating to a ceramic body through firing. Tracing its origins reveals the timeline of advanced pyrotechnology.
Step 1:
The earliest known form of a glassy coating applied to a ceramic material is associated with Egyptian Faience and early Mesopotamian artifacts. These alkaline glazes were essentially crushed quartz mixed with copper compounds (for color) and sodium or potassium salts.
Step 2:
Archaeological evidence indicates that the earliest glazes on stone and faience beads appeared in the 4th millennium B.C., with significant developments around 3000 B.C. in the Middle East (Egypt and Mesopotamia).
Step 3:
Since 3000 B.C. was approximately 3,000 years before the year 1 A.D., adding the current roughly 2,000 years of the Common Era gives us a total of about 5,000 years ago.
Step 4:
Matching our calculation with the provided options, 5,000 years ago is the most historically accurate estimate for the discovery of the first glazes.
\[
\boxed{\text{(2) 5000 years ago}}
\]