第四章 皂化反应
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买到了纯碱，李植还要买生石灰。龙腾小说网ltxsba.com生石灰是明代最常用的建筑材料，在天津卫城里必然会有商店经营。李植找到泥瓦匠聚集的“营房街”，用二十文钱就找到了人带路，到卫城东面的一条“砖瓦街”里买到了生石灰。
生石灰十文钱一斤，李植买了一斤来做实验。
皂化反应需要碱和油脂。接下来，就要买油脂了。明末已经广泛使用黄豆榨油，价格便宜。不需要人带路，李植直接找到了井边坊附近的菜市，找到了卖油的摊位。
“赵三，给我打四斤黄豆油。”
那卖油的赵三见是李植来买油，黑着个脸说道：“你家欠了一屁股债屋子都要被人收了，还吃得起油么？还要炒菜吃么？”
李植见这赵三没事找茬，便骂道：“我家房子是不是被人收了，关你赵三什么事情？你是不做买卖了么？”
听到李植的喝骂，那赵三吃了一惊，拿眼睛上下打量了李植一番。李植以前一直呆呆傻傻的，被人欺辱了也毫无办法，所以赵三才敢欺他。没想到李植今天变得这么机灵，倒是骂起自己起来，赵三一时没有反应过来。
被骂了一次，赵三才老实了一点，黑着脸说道：“你空手来买，用什么装油？”
李植又骂道：“你不是买油送葫芦么？你跟我装什么蒜？”
那赵三想不通李植怎么变了个人似的，变得这么机灵，无奈地从摊位下面摸出一个葫芦，装了两斤豆油递给李植。“三十文一斤，四斤一百文！”
“四斤九十文，你卖是不卖？你要卖的话我明天来买更多！”
听到这话，赵三才明白李植真的不再呆傻了，是真的变聪明了。那赵三既想做生意，又拉不住脸，想了想板着脸说道：“那就匀给你吧！”
李植递过九十文钱，接过了油葫芦。那赵三把油葫芦交到李植手上，忍不住问道：“你明天还来买？”
李植笑了笑，说道：“你要是再便宜些，我天天来买！”
油脂是关键的原材料，消耗量最大。油脂若能便宜一些，肥皂的成本就能下降不少，这值得李植讨价还价。
听到李植精明的话，赵三终于进入了做生意的状态，不再欺诳李植，说道：“若是你明天再来，价格好说，好说！”
李植笑了笑，把葫芦别再了腰上，离开了菜市。
李植提着油葫芦和两包原料回到了自家院子。他路过自家店铺时候，却被弟弟李兴看到。李兴在店里守了一日，也没有等到一个人来买胡椒。此时见李植大包小包回来，忍不住走上来骂道：“你买这么多什么东西回来？还买油？你嫌家里欠的钱不够多是么？”
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