What is a chemistry set? A chemistry set is a new uncommon drop (like a can of paint, rarer than a weapon drop but more common than a salvaged crate), that allows you to craft "strangifiers" that allow certain hats and miscs to become strange, which counts all point earned while wearing that item.
What do strange hats and miscs do? They count points scored while wearing the hat. I don't know how they rank up.
How does it work? When you a chemistry set, it will have a special recipe that involves various weapons, occasionally a hat, and 1 random strange weapon. These recipes are completely random and generated when the set drops. The chemistry set will tell you what strangifier it will craft, in the corner of the recipe window. The merc's pride scarf requires a ton of hats, I do not know why it's different.
I got a recipe that has a salvaged strange/strange festive. Am I screwed? Pretty much, it makes the recipe basically worthless. Since the stranges involved are totally random, you have the same chance of getting a strange festive medigun or a strange shovel in your recipe, so any expensive strange in the recipe ruins it.
What hats and miscs can be strangified? All of them? Nope, at least not at the moment. Currently the list is: Bonk Boy, Fancy Dress Uniform, All-Father, Sight For Sore Eyes, Teddy Roosebelt, The Bird Man of Aberdeen, The Villain's Veil,Archimedes, The Camera Beard, Merc's Pride Scarf, Robro 6000 , and Summer Shades. The current thinking is that they'll release series of chemistry sets, like crates, but that remains to be seen.
I have a strangifier for a Camera Beard, but I only have a vintage camera beard. Will it wipe off the vintage quality and replace it with strange? What about unusuals? Nope. It will simply tack on a strange modifier to the beginning of the title, so it will be a "Strange Vintage Camera Beard", or a "Strange Unusual Villain's Veil". The items text will remain blue or purple, respectively. A unique hat or misc turned strange will have orange strange colored text.
Wanna make out? Sure, but I draw the line at over the shirt stuff.
If I have a multi class misc, and I use a strangifier on it, will it count points for all classes wearing the item? Yep, just as a multi class strange weapon does.
How much does this raise the price of a hat? That remains to be seen. Right now, a loooot. In a few weeks, probably by a key or two.
Do the strange counters disappear with trading? Nope.
Do they reset? Yep, just like any other strange.
aka The Marvelous Breadfish http://steamcommunity.com/id/themarvelousbreadfish