During construction, part of the moisture in the putty will be absorbed by the cement mortar bottom with the same strong alkalinity of the wall base, or the sand-gray bottom (lime, sand, a small amount of cement). With the gradual drying of the putty layer and the volatilization of the moisture, the alkaline substances in the base mortar and putty and some unstable substances after hydrolysis (such as ferrous iron, ferric iron, etc.) will be broken out through the tiny holes of the putty, which will produce chemical reaction after meeting the air, causing the surface of Jinan putty powder to turn yellow.

2、易揮發(fā)性有機(jī)化學(xué)氣體。如一氧化碳(CO)、二氧化硫(SO2)、苯、甲苯、二甲苯、甲醛、煙火等。在一些工程案例中，呈出現(xiàn)在剛刮完奶水妮子的房間內(nèi)使用油漆或生火取暖、甚至是在房間內(nèi)燒香、多人同時吸煙等情況而引起膩?zhàn)颖砻娣狐S。

2. Volatile organic chemical gas. Such as carbon monoxide (CO), sulfur dioxide (SO2), benzene, toluene, xylene, formaldehyde, fireworks, etc. In some engineering cases, the putty surface turns yellow due to the use of paint or fire for heating in the room where the putty has just been shaved, or even burning incense in the room, or many people smoking at the same time.

3、氣候環(huán)境因素的影響。在北方地區(qū)，季節(jié)交換期，一般在11月份至第二年5月份有過膩?zhàn)颖砻娣狐S，但只是個別現(xiàn)象。

3. The impact of climate and environmental factors. In the northern region, the putty surface turns yellow from November to May of the next year during the seasonal exchange period, but only a few phenomena.

4、通風(fēng)干燥狀況不好。墻體潮濕，刮完耐水膩?zhàn)雍螅谀佔(zhàn)訉游慈稍锏那闆r下，長時間緊閉門窗，也容易引起膩?zhàn)颖砻娣狐S。

4. The ventilation and drying conditions are not good. When the wall is wet and the waterproof putty is scraped, the door and window will be closed for a long time when the putty layer is not completely dry, which is also easy to cause the putty surface to turn yellow.

5、基層問題。老墻底一般都是砂灰墻(石灰、啥子、少量水泥，有的還慘有石膏)，這類墻基層強(qiáng)度低、吸水率高、易粉化，而新墻底是以水泥砂漿為主，但還有不少地區(qū)在用石灰、石膏抹墻。基層墻體中的材料大多呈堿性，膩?zhàn)咏佑|墻體后，一些水分會被墻體吸入，通過水解、氧化后，有部分物質(zhì)，如堿、鐵等，會通過墻體微細(xì)孔折出來，遇空氣后產(chǎn)生化學(xué)反應(yīng)，引起膩?zhàn)颖砻娣狐S。

5. Grassroots issues. The bottom of the old wall is generally sand-sand wall (lime, sand, a small amount of cement, and some have gypsum). This kind of wall base has low strength, high water absorption, and is easy to pulverize. The new wall bottom is mainly made of cement mortar, but there are still many areas where lime and gypsum are used to plaster the wall. Most of the materials in the base wall are alkaline. After the putty contacts the wall, some water will be absorbed by the wall. After hydrolysis and oxidation, some substances, such as alkali and iron, will be broken out through the wall micro-holes, which will produce chemical reaction after meeting the air, causing the putty surface to turn yellow.