AR 300-40 series metal-ion free Developer for AR resists
Information on developer processing (→ see also information on developers AR 300-26 and 300-35)
If metal ion-free developers are diluted, it is recommended to adjust the desired normality immediately prior to use by very careful dilution (with scales) of the stronger developer with DI water. Even small differences in normality may cause larger differences in the development rate. Developers should be used as fast as possible, since otherwise developer efficacy may be reduced.