the weapons return to normal if you put them in a chest and log out i believe but the inf items force me to craft 99 of whatever im trying to make aka a workbench
they all work fine on my gog version 1.3.02 but on steam 1.3.03 the mana doesnt work at all and the health value is switched with the mana one (i had 20 on a new guy and my health was locked at 20 but when i buffed it using stars it capped out at whatever my max mana was but it was working)
I just duplicate the 99 item of similar type and then use them to craft whatever I need. The rest I sell for coins...not that it needs to be sold, now that we have inf item option.