Yes, inks within each range can be mixed.  

However, when mixing between ranges, e.g. PERMASET SUPERCOVER® opaque inks with PERMASET AQUA® transparent inks, it is important to exercise caution. First, the opacity of the print will be reduced compared to a print with PERMASET SUPERCOVER® ink alone. This will be particularly noticeable in prints over dark backgrounds. Second, some combinations exhibit slight to significant incompatibility. As above, exercise caution and test first before embarking on a production run.