Summary: The rare book "KALANIDHI," a part of the BACC No. Ris lBb collection, was reprinted from the Journal of the Oriental Institute, with a first edition in 1984 and 250 copies. The book, focusing on a Sanskrit prose-romance, unveils intricate details about the manuscript's preservation techniques, such as the use of opaque yellow paste for corrections and marginal additions by the copyist. The text contains marginal errors like repeated or misspelled letters, alongside precise numbering discrepancies. Despite some textual variations among the P, B, N, and K manuscripts, the overall content remains identical. The principles of text constitution reveal the meticulous copyist's adherence to the original manuscript. The text also delves into the historical background of the manuscript's age, dating back to the 15th or 18th century, comprising a myriad of characters and motifs. The detailed analysis showcases the meticulous efforts of the Jain monks in preserving ancient manuscripts, shedding light on the rich heritage encapsulated within the pages of "KALANIDHI."