How do Professional Killstreaks work?

I'm going to buy a Strange, Professional Killstreak weapon.

I have a sever where it lets you farm kills, I want to use it for the strange quality, I can get to 5000 kills in 30 minutes with the server.

I know that professional killstreak makes your weapon glow for the certain killstreak count 5-20, Red, Blue, Pink, Orange, Yellow, Bright Green, Subdued Green, and Purple but...

My question is: is the glowing effect permanent for each stage, and will it stay like that? If I farm on the server, and get 1000 kills, will I completely bypass the other colors, and go straight to purple really quickly, and won't be able to get the other previous colors EVER, or does it reset every time I join a new server. And does it go with the same thing with particle effect to the user's eyes?

Reason for this question, I want to see the different colors, but I also want to get to Hale's own 5000 kills on the strange.

team-fortress-2

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What do professional killstreaks do?

In addition to a kill counter and a colored sheen, Professional Killstreak Kits also cause the weapon to add a particle effect to the user's eyes.

What is the difference between specialized Killstreak and professional Killstreak?

Difference between specialized vs professional? Specialized makes the weapon glow a color, professional makes your eyes produce a certain effect, like fire horns or a tornado. Specialized only has the killstreak and killstreak effect while professional has those and a sheen.

What is a professional Killstreak weapon?

Professional Killstreak Kits are weapon specific and will count killstreaks, apply a weapon sheen, and they will emit particle effects from your players eyes which gets stronger the higher your killstreak gets. The particle effect and sheen will be displayed on the tooltip of the Killstreak Kit.

Do professional Killstreak effects stack?

No. Separate professional killstreaks will not combine their effects and glows when you reach a killstreak over 5.

TF2: Killstreak weapon crafting tutorial and explanation

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Images: Ivan Samkov, Ksenia Chernaya, Ksenia Chernaya, Ksenia Chernaya