Making FLASH WARNING effect in spark ar

Hey guys, probably you have seen this new trend on TikTok called “flash warning”, If u don’t here are some examples in this video: flash warning~tik tok - YouTube

So, I decided to make a similar effect like this on Instagram and started testing things…
I got that one of the best choices is the tritone color patch in the spark ar library, We can use it and just adjusting the numbers, But actually, I’m not getting the best result. Do u guys have any better suggestion to do that?

It looks like they are using a gradient map and animating the uv of the gradient. You can do this with a combination of my old gradient map patch and some uv manipulation.

For the UV offset, you can add to the x value and use a modulo(1) to make it repeat.