Confirming earlier statements issued to BJP, PX600 will be released next month, Impossible says, "once the demand for PX100 is fulfilled in approximately three weeks."

The confirmation comes as Impossible officially launched its PX100 film for SX-70 instant cameras today. The first flush edition of the film can be ordered on Impossible's website.

However, the firm has warned that the film is highly sensitive to outside factors. "The development of PX SilverShade monochrome Instant Films is based on highly sensitive chemical material which is extremely fragile to outside factors, changing color and contrast triggered by various parameters."

It advises users to keep the image warm when it is developing, adding a recommendation to take "your first test shot inside at room temperature". It also urges photographers to shield the film from light when it is developing. "Please do carefully read the instructions here in order to optimize your results and learn," says Impossible.

An initial hands-on test performed by BJP showed the high sensitivity of the PX100 film. Check it out on our blog, 1854.