First draft

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# Introduction
This is the first paragraph of the introduction chapter.
## First: Images
This is the first subsection. Please, admire the gloriousnes of this seagull:
![A cool seagull.](images/seagull.png)
A bigger seagull:
![A cool big seagull.](images/seagull.png){ width=320px }
## Second: Tables
This is the second subsection.
Please, check [First: Images] subsection.
Please, check [this](#first-images) subsection.
| Index | Name |
| ----- | ---- |
| 0 | AAA |
| 1 | BBB |
| ... | ... |
Table: This is an example table.
## Third: Equations
Formula example: $\mu = \sum_{i=0}^{N} \frac{x_i}{N}$
Now, full size:
$$\mu = \sum_{i=0}^{N} \frac{x_i}{N}$$
And a code sample:
```rb
def hello_world
puts "hello world!"
end
hello_world
```
Check these unicode characters: ǽߢð€đŋμ
## Fourth: Cross references
These cross references are disabled by default. To enable them, check the
_[Cross references](https://github.com/wikiti/pandoc-book-template#cross-references)_
section on the README.md file.
Here's a list of cross references:
- Check @fig:seagull.
- Check @tbl:table.
- Check @eq:equation.
![A cool seagull](images/seagull.png){#fig:seagull}
$$ y = mx + b $$ {#eq:equation}
| Index | Name |
| ----- | ---- |
| 0 | AAA |
| 1 | BBB |
| ... | ... |
Table: This is an example table. {#tbl:table}

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# Installation
This is the installation chapter.
For further information, check the [Introduction] chapter.
For further information, check the [this chapter](#introduction).
For further information, check the [this chapter's subsection](#first) section.

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# Usage
This is the usage chapter.

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# References
- [Pandoc](http://pandoc.org/)
- [Wikipedia: Markdown](https://wikipedia.org/wiki/Markdown)
- [PyroData.com](https://pyrodata.com)
- [PyroGuide wiki (hosted at PyroData.com)](https://pyrodata.com/PyroGuide/default.htm)
- [Alan's lab Pyrotechnics (vk2zay.net)](http://www.vk2zay.net/category/4)
- [Pyrotechnics FAQ rec.pyrotechnics (stason.org)](https://stason.org/TULARC/entertainment/pyrotechnics/index.html)
## Databases
- [Vk2zay.net composition DB](http://www.vk2zay.net/composition/)
- [PyroData composition DB](https://pyrodata.com/composition/A)
- [PyroData chemical DB](https://pyrodata.com/chemicals)
## Wikipedia

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# Chemicals
In pyrotechnics specific chemicals are used for different effects and as helpers during manufacturing like solvents.

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## Ethanol
Formula:
C2H5OH
Synonyms:
Alcohol, undenatured, Ethyl Alcohol, Dehydrated Alcohol
Description:
Ethanol is used as a solvent. Red gum and shellac, two common binders both dissolve in ethanol well. Ethanol/water mixtures are also often used since the ethanol increases the 'wetness' of the water (it reduces the surface tension of the water) and reduces the solubility of common oxidisers.
**Sources:**
Chemically pure ethanol can be quite expensive due to increased tax, unless it is used for laboratory purposes. Denaturated alcohol (usually a mixture of ethanol and methanol) has been made undrinkable and therefore a lot cheaper. It can be used for pyro purposes. Some types of denaturated alcohol exist with other chemicals mixed in besides methanol to make it undrinkable and recognisable as such (colorants etc). I have no idea what these extra additives are and whether they can cause problems in compositions. I have been using 'spiritus' (a well known type of denaturated alcohol in the Netherlands) for several years without problems.
Hazards:
Ethanol is flammable and volatile. Ethanol vapour is heavier than air and spreads over the ground. Provide adequate ventilation when working with ethanol