Sipping rubbing alcohol near your CPU while removing thermal paste is a common practice for cleaning purposes.
Sipping rubbing alcohol near your CPU while removing thermal paste is a common practice for cleaning purposes.
It's fine, no need to worry about it from here and since you indicated the color difference is gone that means it's dried out completely. It will not degrade the chip in any way, only way it could affect the chip would be to damage or kill it right when you press the power button but that didn't happen and frankly, you're past that point of worry about it now. The blower was a good call for making it dry out in a short period of time so you could carry on.
I would have waited a day if I had spilled alcohol on it. I used a cloth with too much liquid, rubbed it, and some spilled over. It dried quickly afterward. I’d experienced this before and thought everything was okay since all surfaces were dry. After turning it on, it worked fine even though there might have been a bit of alcohol underneath. This time I checked after removing the CPU and felt a little worried. After letting it sit under mild conditions for less than an hour, it looked dry but was busy with yard work—so I let it dry a bit longer. Then I touched the CPU socket with my hands; it barely felt wet. I briefly put a paper towel on it just in case. The CPU didn’t move or bend, so I used a vacuum blower for a few minutes. Eventually, I told myself it was probably just a small amount of liquid that had seeped in from the cloth and was safe to use. It worked fine.
It's mainly alcohol and it should disappear within a few minutes at most. Running a fan over it for roughly 15 to 20 minutes should handle the situation.