Liquid glycerin with melt and pour question.

[Dinsdalia]

Im new to soap making and have started out with melt and pour first. I saw a recipe for a soap, I lost the link and have not been able to find it again.
The recipe was for melt and pour glycerin that was poured in a loaf pan, she only added fragrance, and squares on colored block soap. But she also added like 2 teaspoons of liquid glycerin to the melt and pour. What is the bottle of liquid glycerin for and why did she add some to melt and pour, what does it do?

 

[LondonSuds]

Chances are high the glycerin was used to mix the colors, which are then mixed into the melted soap.