if you write characters in not Unicode type in colored emoticons you are also displayed through solid blocks, in this case the quartz block.
MCPE-19613
bug of the sing and solid block
Resolved
Duplicate
0
(Unassigned)
Unconfirmed
Tablet - Android - Samsung Galaxy Tab 4 Nook
Android 5.0.2
1.0.0
Retrieved
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However, this issue has been closed as a Duplicate of MCPE-16998.
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