Getting the sagger smoke better now. I was getting either no smoke in the crackle or to black. Seems better now. Have worked out that by opening the sagger when still very hot i can alter the effect by re oxidizing or adding more saw dust to the bottom of the sagger.
One of my latest pots. After smoking in a sagger to 600 deg c. I got the crackle effect to stand out a bit more. Had to open the sagger to re-oxidize a bit as it was to dark. Re-oxidized at 400 deg c.