ParticleSystem:setColors
Sets a series of colors to apply to the particle sprite. The particle system will interpolate between each color evenly over the particle's lifetime.

Arguments can be passed in groups of four, representing the components of the desired RGBA value, or as tables of RGBA component values, with a default alpha value of 1 if only three values are given. At least one color must be specified. A maximum of eight may be used.

In versions prior to 11.0, color component values were within the range of 0 to 255 instead of 0 to 1.
ParticleSystem:setColors( r1, g1, b1, a1, ... )
r1 number First color, red component (0-1).
g1 number First color, green component (0-1).
b1 number First color, blue component (0-1).
a1 (1) number First color, alpha component (0-1).
... number Additional colors.
ParticleSystem:setColors( rgba1, ... )
rgba1 table First color, a numerical indexed table with the red, green, blue and alpha values as numbers (0-1). The alpha is optional and defaults to 1 if it is left out.
... table Additional color, a numerical indexed table with the red, green, blue and alpha values as numbers (0-1). The alpha is optional and defaults to 1 if it is left out.