FIELD: personal usage items.
SUBSTANCE: invention relates to dehydration indicators for introduction of absorbent into product of personal hygiene. Sensor of human body dehydration comprises a porous substrate, on part of which buffered ink system is applied. Mentioned ink include from 0.5 to 20 wt% of a weak polymeric base as buffer agent, a viscosity modifier and pH-sensitive dye. Polymer base is represented by polyallylamine, polyethylenimine, polyvinylamine hydrochloride or their combination; substrate is a cellulose material. Adding to clothing or personal hygiene absorbent product is also described containing mentioned dehydration sensor.
EFFECT: buffered ink of dehydration sensor prevent dye leaching out of porous substrate during the analytical procedure providing colour stability and reliability of results in tracking body saturation with water.
17 cl, 4 dwg, 1 tbl, 5 ex
