Had a look into the new developer tools Valve released last week.
When granted, items now can be given tags with a certain probability.
Still trying to wrap my head around all the possibilities this awesome new feature offers.
Quite happy with the results so far. Have a look
http://steamcommunity.com/id/30LL0x/inventory/#590790_2_1887440077976910317
http://steamcommunity.com/id/30LL0x/inventory/#590790_2_1887440077976755968
http://steamcommunity.com/id/30LL0x/inventory/#590790_2_1887440077976910352
http://steamcommunity.com/id/30LL0x/inventory/#590790_2_1887440077976781924
http://steamcommunity.com/id/30LL0x/inventory/#590790_2_1887440077976919183
http://steamcommunity.com/id/30LL0x/inventory/#590790_2_2547216714203745473
http://steamcommunity.com/id/30LL0x/inventory/#590790_2_1887440077976756478
http://steamcommunity.com/id/30LL0x/inventory/#590790_2_1887440077976919836
http://steamcommunity.com/id/30LL0x/inventory/#590790_2_1887440077976910866
http://steamcommunity.com/id/30LL0x/inventory/#590790_2_1887440077976755935