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Something dark is not necessarily "impenetrable to light". A dark sky, for example, may still feature starlight or moonlight. The questioner is looking for an alternative to opaque that will not be misread as translucent. "The material is opaque" means no light is seen through it, not that it is dark. A disk of unpainted steel is opaque (you can't see through it unless you've got Xray vision), but it is most certainly not dark.
– Cyberherbalist
Commented Jan 30, 2015 at 1:03

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Correct minor typos or mistakes
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create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
quote by placing > at start of line
to make links (use https whenever possible)
<https://example.com>
[example](https://example.com)
<a href="https://example.com">example</a>

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