There is provided an aqueous seaweed extract in the form of a solution concentrate composition comprising: (a) at least 0.5 % by weight soluble alginate based on the weight of concentrate composition； (b) at least 0.1% calcium by weight based on the weight of concentrate composition； (c) a calcium-chelating agent； and (d) a borate compound.本發明提供一種呈溶液濃縮物組成物形式之水性海藻萃取物，其包含：(a)以該濃縮物組成物之重量計，至少0.5wt%之可溶性藻酸鹽；(b)以該濃縮物組成物之重量計，至少0.1wt%之鈣；(c)鈣螯合劑；以及(d)硼酸鹽化合物。
