The HFE-7100 blends described in this work could be viewed as a step backwards given the inclusion of heptane and the associated flammability hazard that poses. This hazard mandates that the HFE-7100 sprays described here be employed in a well-ventilated, ideally laboratory-based setting. However, given that imports of the safer HCFC carrier solvent are already being impacted by phase-down restrictions, it is inevitable that both its cost and scarcity will rise, demonstrating a need for alternate HFE-based developers as a stopgap measure. Implementing these HFE-7100 blends in laboratory settings may benefit the forensic community by prolonging stockpiles of increasingly scarce and costly HCFC carrier solvents (i.e. AK-225) for sole use in crime scene settings.