Which of annes treasures was accidentally cremated?

Anne Frank’s treasured diary, which she referred to as her "book," was accidentally cremated after the war. After her death in a concentration camp, her father, Otto Frank, was the only member of the family to survive and he later found the diary among Anne's belongings. The cremation refers to the loss of many of her other personal items, but her diary was preserved and published, becoming a significant historical document.