Since Kodak no longer makes Tech Pan 4 x 5 film, I was wondering if anyone has any experience using Arista APHS Ortho Litho Film? The purpose of my mission is for my next trip where I will be photographing pictographs and petroglyphs that require very high contrast film to properly capture. However, Arista states that this film should be developed in "A&B" chemicals (whatever this is?). My experience has been that good old HC110 works for about everything? Any help and suggestions would be appreciated.