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