sentences:  Paintings were mostly on paper, but sometimes on ivory, especially those from Delhi.They were mostly intended to be kept in portfolios or albums; the muraqqa or album was very well established among Indian collectors, though usually including calligraphy as well, as least in Muslim examples.The style developed in the second half of the 18th century, and by the early nineteenth century production was at a considerable level, with many of the cheaper paintings being copied by rote.