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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

চামড়ার পিকলিং করতে শতকরা সালফিউরিক এসিড ব্যবহার করা হয়?

A. 0.5
B. 3.5
C. 1.5
D. 2.5
সঠিক উত্তরঃ C. 1.5
Explanation:

Another Explanation (5): ```html

চামড়ার পিকলিং-এ সালফিউরিক অ্যাসিডের ব্যবহার

চামড়ার পিকলিং প্রক্রিয়ায় সাধারণত 1.5% 😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱????😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱😱

পিকলিং কেন করা হয়?

  • এটি চামকের সংরক্ষণকালে pH-এর মাত্রা কমিয়ে🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠🦠
  • হাইড্রোজেনেশন প্রক্রিয়ার জন্য চামককে প্রস্তুত করা এবং ট্যানিং করার সময় চামড়ার ফুলে যাওয়া রোধ করে।

    \(\small{H_2SO_4}\)

```