Do not soak wooden stamps if you decide to soak the stamp.
Soak most stamps in lukewarm water.
The possible way how to pretend the color change is to exchange two fake fingers, each of a different color or to use two inks and to soak the stamp in the second ink during the capturing process.
Those who devote their main attention to cutting food stamps or soaking the rich are grinding ideological axes, not confronting fiscal realities.
If that is a concern, use the wipes method instead; alternatively, only wipe, do not dip (and definitely do not soak) the rubber stamps.
An agarose stamp soaked with an appropriate chemical reactant can etch/dissolve the desired hard material by simply contacting with the substrate (e.g., HF for SiO2 or HCl/FeCl3 for Cu) [18 20].
If the paper does not come off, let the stamp soak longer.
The paper can be trimmed neatly around the stamps or the stamps can be soaked free in warm water and then dried face down on paper towels.
The PDMS stamp was soaked in etching solution (2% mixed acid in alcohol) for 10 min and absorbed approximately 4% etching solution, and the residual solution on the surface of stamp was removed by N2 flow.
The PDMS stamp was soaked in etching solution for 10 min and absorbed in the latter, and the time period for etching process was within 5 min. After nanoindentation by the RD-WETS process with PDMS membrane stamps, anodization was conducted under a constant voltage in phosphoric acid solution.
