A wetness indicator composition contains (a) 0.1 % to 5% by weight of a pH indicator that is substantially colorless at pH 7 and develops a color in an acidic environment, (b) 20% to 90% by weight of a surfactant, (c) 5% to 55% by weight of a polyalkylene glycol, (d) 0% to 70% by weight of a polymer having a carboxyl group, and (e) 0.1% to 5% by weight of an acidic substance other than components (b) and (d). In an absorbent article including a topsheet 2, a backsheet 3, and an absorbent member 4 interposed between the topsheet 2 and the backsheet 3 and having applied thereon a hot-melt composition that changes color on contact with a body fluid, the wetness indicator composition is used as the hot melt composition.本發明提供一種潤濕指示劑組合物,其包含:0.1~5重量%之pH值指示劑(a),其於pH值為7時,實質上無色且於酸性區域中顯色;20~90重量%之界面活性劑(b);5~55重量%之聚烷二醇(c);0~70重量%之具有羧基之聚合物(d);以及0.1~5重量%之除(b)及(d)以外之酸性物質(e)。本發明並將該潤濕指示劑組合物用作包含正面薄片2、背面薄片3以及介於兩薄片2、3間之吸收體4,且塗佈有藉由與體液接觸而變色之熱熔組合物的吸收性物品中之熱熔組合物。1...尿片1b、1c、5b、5c...端部2...正面薄片4...吸收體5...指示劑7...彈性構件8...腿部彈性構件9...黏扣帶10...著扣區域70...薄片材料A...股下部B...腹側部C...背側部
