The SPUR Ultraspeed Vario development system is an advanced push and pull processing technique that allows
for exposure and development of films with virtually any speed. Absolutely new about this development system is that a broad variety of contrasting is available at a chosen speed.
This holds true for the push band, and – to a minor extent – for the pull band of development.
The full data sheet under this link availabl: http://spur-photo.com/wp-content/uploads/Data-Sheet-SPUR-Ultraspeed-Vario-10-05-14.pdf