The descriptive details from the text best help the reader visualize the specific early Victorian tea set that is the central topic of the text is:
"Some of the most expensive stoneware ceramics aiming at a much wider market"
A central idea of a topic is the idea or general thought that unifies all the other parts of that text.
From the excerpt that is referenced (see the attached), it is clear that the descriptive detail that helps one to visualize the central idea or topic is:
"Some of the most expensive stoneware ceramics aiming at a much wider market"
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