Found some interesting Acoustic guitar care articles on the internet. Have a look specially if u are importing your guitars to india from the west, especially for those who own Martin, Taylor, Gibson, Ovation or other high end guitars This one is a nice article on general care of a acoustic guitar. https://www.acousticfingerstyle.com/CareAndFeeding.htm Effect of humidity on Acoustic guitars https://www.maurysmusic.com/humidity___acoustic_guitars Guitar humidifier https://cachepe.zzounds.com/media/guitar_humidifier-eeff05f6d0eb70b1d9748a77a6c3d367.pdf https://www.digitalcartography.com/18ahg.htm P.S: if u own a martin you would probably know this by now :