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Q4: Is the “Burning Identification Technique” as used by certain manufacturers genuine?  

2010-06-08 22:51:39|  分类: English |  标签: |举报 |字号 订阅

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  A: First of all, let us explain the most common trick used by some of the manufacturers in the market. Normally, they will place a small amount of their product on a stainless steel spoon and burn it with small fire. Once the water is dried off, the spoon is left with what is so-called yellowish “soapberry oil”. When you mixed it with water, it will restore to its original form immediately. And this “yellowish soapberry oil” is actually none but the synthetic chemical cleansing agents – Nenylphenol Polyethoxulates, or NPEO in short. What will happen then when burning the saponin? Or rather, how will it react? When you place a small portion of coffee-color soapberry liquid on a stainless steel spoon and burn it with small fire, when the water boils, you’ll see plenty of bubbles. When you continue burning it until the water evaporates conpletely, the remnants will gradually turn to deep black and will give a smell of caramel flavor. Ultimately, the remnant will catch fire and become black residue. Reaching this state, you can only use brushes to clear away the stain. And this should be the right incendiary identification technique for testing the genuineness of soapberry products.
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