Abstract: An indicator system and device for visually monitoring ethylene oxide sterilization by color changes of the indicating composition of the system upon sufficient and properly conditioned exposure of the composition to ethylene oxide provides a controlled method for indicating the effective sterilization of articles by ethylene oxide. The indicating composition of this invention undergoes color changes that are progressive with the conditions and periods of sterilization, such that a final and complete color change indicates the completion of an effective ethylene oxide sterilization. The indicating composition comprises a leuco precursor of an aryl methane dye selected from the groups herein defined; and an acidic constituent. Acidic organic compounds such as diphenolic acid (4,4-bis [4-hydroxyphenyl] pentanoic acid) are effective acid constituents because they enhance hue, develop color and stabilize the final color change.

Abstract: Either a monitoring resin piece associated with an electrical appliance or a resin piece forming a part of the insulating components of the electrical appliance is taken out after the electrical appliance has been operated for a suitable period of time, and either the ratio of the number of hydrogen atoms to the number of carbon atoms or the ratio of the number of oxygen atoms to the number of carbon atoms is measured to estimate the insulation life of the resin insulator of the electrical appliance.

Abstract: An in-vitro diagnostic method is provided for detecting acetylsalicylic acid ingestion by a patient by utilizing radioimmunoassay procedure.