Are the prints on the sheets watermarked or offset printed?

the printing on the sheets belongs to textile printing.

At present, water-based pigment (paint) printing is the main printing method for bed sheets.

the advanced one is dye printing, which is more expensive but has high added value.

all textiles except non-woven fabrics are printed with pigments or dyes. The printing method is realized by drum and screen printing (including manual flat plate/machine printed flat plate or rotary screen).