A novel reversible relative-humidity indicator ink based on methylene blue and urea.
A new relative-humidity sensitive ink based on methylene blue and urea is described which can utilise the deliquescent nature of urea.
Mills
Andrew
A
Department of Pure & Applied Chemistry, University of Strathclyde, Glasgow, UK. a.mills@strath.ac.uk
Grosshans
Pauline
P
Hazafy
David
D