Solid state device for monitoring integral values of time and temperature of storage of perishables

摘要: An indicator composition and process capable of changing color in relationship to its exposure a temperature above below base line the time said exposure, for monitoring time-temperature history substrate, depositable as layer on comprising dispersion either binder reaction inert, neutral finely divided absorbent, presence reactant salt an acid or organic compound substituted by at least one moiety which, ionic form, is anion binder/reactant, solid polymer whose constituent units contain, covalent substituent, anion; indicator, sensitive pH dye activator, base. This may be utilized form state device integral values during storage perishables. The single indicating deposited upon substrate. required change activation energy can varied varying concentration nature reactants, catalysts, additives polymeric binder/reactant matrix. gradual abrupt exhibited continuous strip, alphanumeric symbol(s) array which read bar code reader.