I've been making a batch of terra sig for the second time from raw clay. I believe the density after mixing the clay and water was about 1.18. After twenty hours sitting however there is no difference in layers in the preparation. I have used for the most part water afloat from my recycling clay buckets already thicker than water. Would it be the reason the deflocculation is taking more time ?
How was your soda ash stored? If not kept sealed up in an air tight container it will change from sodium carbonate into sodium bicarbonate, which is a flocculant.