Spur HRX is a very fine grain developer with high sharpness and excellent local contrast. The sensitivity of the film becomes a bit lower than box speed. The high sharpness and local contrast (compared to other fine grain developers) results in a better resolution.
The developer consists of two parts, which are mixed evenly.
Because of the very fine grain this developer is very good for photos which contain big areas of homogeneous tone (clear sky, glass on buildings, etc.)