Ok ... ironically this is what I do presentations on 3 days a week to engineers !
Powder or tablet sensitive Non Bio ... contains Bleach, Perfume, Surfactants, Polymers & Builders (softners) ... no enzymes (they are responsible for breaking up NATURALY occuring stains ie sweat, grass, bark, soil ... the bleach is what affects the colour ... enzymes are the prime irratator so this is why if you look at the ingredients on a "sensitive" product they will be missing. Perfume (and bleach) can also be an irritant which is partly why some brands now come in 2 or more fragrances ... so if one irritates you can try another without leaving the "brand"
Liquid Non Bio (bottle & liqui tabs) ... they contain Perfume, Surfactants, polymers, Builders & enzymes ... no Bleach ... they are better for your colours but you will have a hard time removing stains from very pale or white clothing with liquids as there is no bleach ...
Powder or Tablet Bio ... they contain all the 6 key components to get your clothes clean .. Bleach, Enzymes, Polymers, Perfume, Builders & surfactants ... ideal for your whites & very pale clothing ... over time (after about 10 washes) you can start to see the detrimental effect on the colur balance between the garment & an identical one (should you have one)
PS DONT use regular detergent on wool, silk or cashmere ... they either contain enzymes ( remember they break up natural stains so they will also destroy natural fibres) or they will have bleach ...
Something like Dreft or Persil wool & silk is designed to wash wool, silk and cashmere for this very reason ... it is not a ploy to get you to buy another product