If you want to build a material, you will need a Material Builder!
Doesn't sound that hard, does it?

It might be required for you to import the package if you encounter any issues, so better be safe than sorry and add the import.
import mods.contenttweaker.MaterialBuilder;

You can retrieve a new, clear Builder using the MaterialSystem Package:

ZenScript
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var mBuilder = mods.contenttweaker.MaterialSystem.getMaterialBuilder();

You can set these Properties

ZenMethod	Parameter
ZenMethod setName(name)	Parameter string name
ZenMethod setColor(color)	Parameter int color
ZenMethod setColor(color)	Parameter CTColor color
ZenMethod setHasEffect(hasEffect)	Parameter boolean hasEffect

All these Methods do 2 things: Firstly, they change the builder's Property, secondly they return the modified builder.
You can see in the example scripts below what this means.

Before you can build your material, you need to build it:

ZenScript
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mBuilder.build();

This returns an IMaterial Object.

ZenScript
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import mods.contentTweaker.MaterialSystem;

var builder = MaterialSystem.getMaterialBuilder();
builder.setName("Urubuntu");
builder.setColor(000151);
builder.setHasEffect(false);
val urubuntu = builder.build();

val arakantara = MaterialSystem.getMaterialBuilder().setName("Arakantara").setColor(15592941).setHasEffect(true).build();