When inspiration struck, The Beatles scrawled their lyrical ideas for the hit "A Hard Day's Night" on the back of a birthday card.
It is currently on display in the Treasures' Gallery at the British Library in London.
It's a birthday card so it's mostly made of paper, which is an organic material.
No data is available online. You'll have to go see it in person!
Any exposure to fire would effectively destroy this object. Since it is paper, the organic material would burn rapidly from the edges. Even if the fire was extinguished quickly, the burnt paper and ash would distort the writing on the card, removing much of the object's historical and cultural significance.