diff --git a/chapters/01-introduction.md b/chapters/01-introduction.md
index cbdc78b..3fccc2c 100644
--- a/chapters/01-introduction.md
+++ b/chapters/01-introduction.md
@@ -1,74 +1,3 @@
 # 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}
diff --git a/chapters/02-installation.md b/chapters/02-installation.md
deleted file mode 100644
index c575165..0000000
--- a/chapters/02-installation.md
+++ /dev/null
@@ -1,11 +0,0 @@
-# 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.
diff --git a/chapters/03-usage.md b/chapters/03-usage.md
deleted file mode 100644
index ad06f02..0000000
--- a/chapters/03-usage.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Usage
-
-This is the usage chapter.
diff --git a/chapters/04-references.md b/chapters/04-references.md
index b4d8446..628af67 100644
--- a/chapters/04-references.md
+++ b/chapters/04-references.md
@@ -1,4 +1,15 @@
 # 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
+
diff --git a/chapters/99-0-chemicals.md b/chapters/99-0-chemicals.md
new file mode 100644
index 0000000..680b2a1
--- /dev/null
+++ b/chapters/99-0-chemicals.md
@@ -0,0 +1,3 @@
+# Chemicals
+
+In pyrotechnics specific chemicals are used for different effects and as helpers during manufacturing like solvents.
diff --git a/chapters/99-1-chemical-ethanol.md b/chapters/99-1-chemical-ethanol.md
new file mode 100644
index 0000000..c2b7218
--- /dev/null
+++ b/chapters/99-1-chemical-ethanol.md
@@ -0,0 +1,17 @@
+## 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