(Bloomberg/Samantha Kelly) — Amazon.com Inc.’s new Kindle Scribe Colorsoft is the company’s most serious effort yet to turn its e-reader into a productivity tool. But with a starting price of $630 — making it the priciest Kindle yet — Amazon will need to persuade even its most loyal readers that the upgrade is worth it.

The device, which goes on sale starting in the US Wednesday, is an extension of Amazon’s pen-enabled Kindle Scribe line that launched three years ago. It’s the first in this series with a color display, and one of only a few color-screen e-readers that Amazon has made. The 11-inch panel also makes it the largest-screen Kindle ever.

Other than having a slightly larger, colorful screen, it brings an improved pen, a convenient way to pull in files from some popular cloud ser

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