The better grades of chiang-yu-tung are soft, almost self-lubricating, with color distributed throughout each piece, and thus are a seal carver's delight.
上品醬油凍質潤、色純而勻，極易奏刀，刻印者下刃時多能得心應手。若石色黑而帶砂者，則為下品，不能歸入「凍」品級。和易受刃的青田石一樣，醬油凍可塑性極大，可刻成各種形狀。