What can I use instead of acid and how do I fill that ink in the pen?
Md Ariful Islam
বিএসসি(সিএসই)
,
এমবিএ(মার্কেটিং)
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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
Lemon juice or vinegar should work. For the pen, maybe you could take an empty pen and try adding the ink with a syringe.
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