Dmitri gives Polaroid SX-70 B&W instant film a thorough review including characteristics curve in Polaroid B&W SX-70 Instant Film Review on Analog.Cafe. According to Dmitri, the film appears slightly sharper than colour Polaroid film and has 2 - 4 stops of latitude.
Dr. Land first invented Polaroid instant film in 1947 in 8x10 format. His birthday is on May 7th, as we celebrate the 76th year of instant photography as we know it.
Read the article for full details at Polaroid B&W SX-70 Instant Film Review.