Firework Particle Fix
Makes spark_4.png and spark_6.png use the same texture. In vanilla minecraft, there is a single wrongly-coloured pixel in the firework particle texture.
Quick challenge
How far can you run before the mobs catch you?
Minecraft check
Confirm your run
Complete the quick check to get your code.
Firework Particle Fix
A very lightweight resource pack that fixes a texture mismatch for the firework rocket's particle effect.
The firework particle shrinks over it's lifetime, and when it does, it changes texture. Some of these textures look the same, but not if you look closely. Here's a gif to demonstrate:
(Look at the bottom left section of the particle)

This video from PhoenixSC also explains it very well (Skip to 2m13):
Thanks to PhoenixSC for making us never be unable to unsee this!