Acids are proton donors - they lose their Hydrogen (All acids have a H+ ion) atom

Sale 1

http://backpack.tf/profiles/76561198108525949?time=1446796800&compare=1446883200 Bulk for Planets Hairpiece

Sale 2

[No OP Trade] Sold for G. Fetti Larrikin

X = 14*0.9

X = 13

Larrikin http://backpack.tf/item/1717118254

Tricorne http://backpack.tf/item/994172023

Trade http://backpack.tf/profiles/76561198224495352?time=1446710400&compare=1446796800

Mini for Larrikin

http://backpack.tf/vote/id/567b5dd2ba8d88c735a94bfd 14 keys, using 14

Sale 3

http://www.tf2outpost.com/trade/27369249 Sold for Steaming Baker

B/O for Tricorne was 17

B/O for Baker was 13

X = 13*0.9

X = 12

Baker http://backpack.tf/item/506739060

Tricorne http://backpack.tf/item/1845815030

Trade http://backpack.tf/profiles/76561198055096189?time=1446624000&compare=1446710400

Mini for Baker

http://backpack.tf/vote/id/567b6a33ba8d889e36a94c6a 15.5 keys, using 15.5

Sale 4

http://backpack.tf/profiles/76561198147097380?time=1446624000&compare=1446537600 Sold for 8 keys of crap

Sale 5

http://www.tf2outpost.com/trade/27256147 Sold for KS Aussie Flame + S. Lime Boomslang

B/O for Tricorne was 16

X = 14*0.9 + 3.2*0.9

X = 15

Flame http://backpack.tf/item/4041258032

Boomslang http://backpack.tf/item/2385341623

Trade http://backpack.tf/profiles/76561198031371895?time=1446274800&compare=1446188400

Tricorne http://backpack.tf/item/506739060

Seller

http://www.tf2outpost.com/trade/27592445 14 keys