第七百二十八章 牙膏
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然而虽然用香料盖住口腔的口味，但因为没有把口中的脏污清刷干净，偶尔还是会往外冒臭气。就好比再好的香水也难以完全掩盖狐臭一样。李植刚才一不小心闻到的，就是李兴口中的腐臭。
牙齿刷不干净，不但会臭，而且会烂牙齿。这个时代没有口腔医生，牙齿一烂了就没法吃东西，寿命都会受到很大的影响。
李兴见李植纠结于口臭的问题，笑着说道：“大哥，你上次给我一盒的牙膏倒是好用。你要是嫌我口臭，就再给我一盒哩？”
李植摇头说道：“那是草木灰里面提取出来碳酸钾做成的，产量极其有限。想让千家万户都用上牙膏的话，不能依靠那个。”
李兴问道：“那用什么做哩？”
李植说道：“我们试着用肥皂和甘油做牙膏。用肥皂做活性剂，用石灰粉做摩擦剂，用甘油做保湿剂，用树胶做增稠剂。”
李兴没听懂李植说的一大串材料，只是附和着说道：“那好哩，做出来一定好卖。”
李植点了点头，便开始干了。不过这次李植不准备亲自动手，他带着李兴走进肥皂工厂，找来几个肥皂作坊的工匠，把自己设计的制作流程和原材料剂量都告诉给了这些工匠，便站在一边看着。
工匠们倒是聪明，只看了一眼李植的清单，就说道：“国公爷这是要生产胶状的肥皂？”
李植点了点头，说道：“做出来每人赏银子五两。”
工匠们都觉得这东西容易，大声唱诺，便出去买原材料去了。过了一会，工匠们就提着树胶回来了。
首先是生产肥皂和甘油，这一步倒是轻车熟路，也就是寻常的皂化反应就能生成。油脂和烧碱反应形成高级脂肪酸盐和甘油，只要不进行盐析和碱析，这些粘稠的液体就是混合在一起的。
工匠们捞出一些反应产物，在里面加入了磨成粉末的石灰粉和粘稠的树胶，果然就得到了一种含有肥皂和石灰粉的膏状物。树胶不需要放很多，每一盒牙膏中放两勺，就能有很好的效果。
工匠们做出了牙膏，十分欣喜，用自己的牙刷在盒子里蘸了一些，用清水刷了刷牙。
果然，工匠们刷出了一嘴的泡沫。刷完牙齿那工匠用井水冲去泡沫，咧嘴说道：“国公爷，成了！”
李兴跃跃欲试，拿起一把新牙刷也用这牙膏刷了起来，同样是一嘴的泡沫。刷完牙齿，他用舌头舔了舔牙齿，说道：“干净，真干净，我还是第一次感到牙齿刷得这么干净。”
李兴欣喜地说道：“大哥，把这种牙膏卖给天下的达官贵人，又可以赚一大笔钱啊。若是一盒牙膏卖一两银子，天底下有十万富人使用的话，一年就是上百万的大生意。”
李植想了想，说道：“卖给达官贵人，销售要仰赖士绅的支持。如今我们和南方士绅关系紧张，说不定哪天销路就被人断了，太不安全。这牙膏我要卖给百姓，一盒三十文钱便宜卖的话，四省一镇的一千多万百姓一年也要用一、两百万两银子的牙膏，同样是大买卖。”
李兴笑道：“那这下好了，这下子百姓都能刷干净牙齿了。”
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