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MinecraftDecompiler
Minecraft Decompiler. A useful tool/library to deobfuscate and decompile Minecraft(or any jar file) through popular mappings and various decompilers. Or use it as a lib to process obfuscation mappings such as converting a mapping to another format
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If you can read Java code, you can decompile and deobfuscate the client (for example with MinecraftDecompiler) and then search for "jeb_" in the code, which should eventually lead you to the code that decides the color cycle. I've never done this myself, so I can't give further assistance, but I'm pretty sure this approach would get you your answer if you can't find an easier way.