Potters & Sculptors - Making Rock from Mud
Ferro Frit 3124 has alumina and melts at ^05, while 3134 has no alumina but more borax and calcium flux so melts at a much lower temperature of ^015.
3134 with kaolin is a perfect glaze base, so we use it in far greater quantity than other frits. If you ever want an even more fluid glaze, turn to frits with fluorine like 3269 or 5301.
Due to the alumina and less flux 3124 tends to make stiffer glazes while melted. Mastering Cone 6 Glazes use 3124 for their ^6 Majolica, which is a very stiff, hard glaze which tends to crawl.
It will be interesting to see what happens. Taking a chance on a small batch of something new is the only way to discover something no one has seen before.
SCM (Strontium Crystal Magic - cool and warm) is a fluid underglaze which interacts with the glaze on top, giving it more flow and crystallization. Sometimes I wish it imparted less flow, and this change may do that.
A similar situation are the two layer oil spot glazes. I found the top layer looks great on any red iron oxide glaze (red iron oxide is refractory at ^6). I made the original base layer with black iron oxide (a flux at ^6) and it provided so much flow that the top layer of oil spot glaze slid off the ware during the firing except where it was perfectly flat.