Concept:
The red-figure technique was an important pottery painting technique in ancient Greek art.
It replaced the earlier black-figure technique and allowed artists to show more natural details.
Step 1: Understand Red Technique.
In red-figure painting, figures are left in the natural red colour of the clay.
The background is painted black.
This technique made details of the human body, clothing and movement clearer.
Step 2: Identify the civilization.
The red-figure technique is especially associated with Greek vase painting.
Greek artists developed and used this technique with great skill.
Step 3: Final conclusion.
Therefore, the Red Technique in painting was developed by:
\[
\boxed{\text{Greek Artists}}
\]
Hence:
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\]