for lvl 2 the brown ore (dont no what they call)
lvl 3 silver one
4 is gold
5 is blue(mystrile) or somthing like that

GODS SAKE ABOUT THREE ZILLION PEOPLE HAVE PUT THIS!!!
Right- read the one above this 4 the answer...but then again the 1 above this tells u 2 look above...so FINE i'll tell u...
if you have a 'plain' axe that has not been upgraded then you need copper. If you have already upgraded it with copper you need silver- here is a chart:
Plain- (how you first get it with no upgrades)
Copper
Silver
Gold
Mythrill
Cursed- to get this you must have all your tools on mythrill. You are now eligable 4 the cursed tools. To get them you must hunt around the 2 mines. You randomly find them. It is TOTALLY random.
Blessed: To get this you must have the cursed tools. You have 2 get them blessed. There are three ways in which you bless them- you use a different way for a different tool- these are the ways: Carry it around 4 ten days with you, Get Carter 2 bless it 10 times or use it around 267 times- (thats not an exact number.) YOU ONLY USE ONE WAY PER TOOL!!!
and finally
Mythic: You must have as many mythic stones as you want 2 upgrade. SO if you only wanted 2 upgrade 2 tools 2 mythic level you'd only need 2 stones. You use the stones with either MYSTRILL OR BLESSED- I CANNOT REMEMBER.
THERE.

Oh yeah...i 4got 2 add this 2 the message above-
MAKE SURE U HAVE ENUF EXPERIENCE!!!
If you don't have enuf experience 4 that tool then you CANNOT upgrade it- 2 get experience you must use it- what you should do is on a day that you don't mind going blue - or even better on a day you are snowed or rained inside youre house- take out your tool and use it in your house- u r obviously not actually DOING anything but it gets u experience. When the tool is ready u will b able 2 upgrade it.

I agree wit answer 2!!