MANZI1 Pair 70 Denier Women's Tights Stretch Run Resistant Opaque Control Top Tights

Can these be dyed? I nylon tights which won't dye, but I've searched for cotton tights and these came up. Will dye take?

How many comes in a back?? Description says 1-6 but I feel this could be false advertisement

Can these be dyed? I bought nylon tights which won't dye, but I've searched for cotton tights and these came up. Will dye take?

size 16-18 5ft 4. what size should I go for??