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I just tested your book with the Kindle for Android app and the third line is displayed in blue. If the Kindle Fire HD displays everything in black; maybe its Kindle app is outdated or, if you transferred the file via Send to Kindle or Calibre, the MOBI7 version was transferred, which might not work.
I'd recommend that you convert your book with Kindle Previewer and copy the .mobi file that it generates it via USB to the Internal Storage partition of your Kindle Fire HD.
Then select the file in a file manager and open it with the Kindle app.
BTW, if Kindle Previewer shows the colors, all current color-enabled Kindle apps should display the colors, too.
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