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Gallium-based liquid metals have recently been found important in a varietyof newly emerging applications such as room temperature metal 3D printing,direct writing of electronics and biomedicine etc. In all these practices, onefrequently encounters the situations that a printed circuit or track needs tobe corrected or the unwanted parts of the device should be removed as desired.However, few appropriate strategies are currently available to tackle suchimportant issues at this stage. Here we have identified several low cost waystoward this goal by comparatively investigating three typical strategiesspanning from mechanical, chemical, to electrochemical principles, for removingthe gallium-based liquid metal circuits or thin films. Regarding the mechanicalapproach, we constructed an eraser for removing the liquid metal thin films. Itwas shown that ethanol (CH3CH2OH) could serve as a good candidacy material forthe mechanical eraser. In the chemical category, we adopted alkalis and acidsto remove the finely printed liquid metal circuits and sodium hydroxide (NaOH)solution was particularly revealed to be rather efficient in making a chemicaleraser. In the electrochemical strategy, we applied a 15 V voltage to a liquidmetal thin film (covered with water) and successfully removed the target metalpart. These methods were comparatively evaluated with each of the merits andshortcomings preliminarily clarified in the end. The present work is expectedto be important for the increasing applications of the liquid metal enabledadditive manufactures.

Erasing and Correction of Liquid Metal Printed Electronics Made of Gallium Alloy Ink from the Substrate