(C#) Changing color of SpriteRenderer in script causing gameObject to not render

Questions & Answers
1

I have a bunch of 2D sprites in my game, all Instantiated from prefabs. I want to change the color of the SpriteRenderer according to a float value, but whenever I do so through this code:

gameObject.GetComponent<SpriteRenderer>().color = colours[someInt];

the gameobject isn’t rendered at runtime. If I comment out that line, it renders

colours is an array of type Color, which I have populated
The shown line is inside Update(), and the script is attached to the prefab

2

What’s in colours array? Are they all transparent?