There are two kinds of stamps: self-inking stamps- which you add ink by yourself. These inks are usually water-based. The second type is pre-inked stamps. These inks are generally oil-based. Again, check with the manufacturer and make sure which type your stamp uses. General Instruction The oil-based ink will be absorbed into either rubber or sponges. The process is a lot slower than water-based ink. However, the ink is designed to last a long time in the open air, so be patient.
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10ml 5ml Colorful Flash Ink for Photosensitive Flash Stamp DIY Inkpad Refilling Stamp Ink Oil for Make Seal