第十七章 硝石制冰,我们是神仙
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子手段通天,连反季节的冰都能弄到?”
“嗯。”朱元璋点头,“郭天叙好面子,又好享受。若有此法,他必感兴趣。一来,可转移他对我们那些‘古怪’事情的注意。二来,若此事成了,或许能换些实惠,至少,暂时稳住他。”
“可咱们的硝石……”我有些舍不得。那可是我们辛辛苦苦熬出来,准备做火药的!
“用粗硝,或者硝土。”朱元璋显然已经想好了,“不用多,够他摆宴用就行。关键是,让他相信,我们有‘奇术’。至于麻烦……告诉他方法,让他自己找人去弄。我们只出主意,不沾手。”
高啊!既展示了“价值”(我们有郭天叙需要的东西),又撇清了风险(具体操作你找人干),还能消耗郭天叙的精力(让他折腾去)。万一失败了,也是他手下人办事不力,怪不到我们头上。
“可他会信吗?硝石制冰……听起来有点玄乎。”周德兴挠头。
“所以,得先让他‘眼见为实’。”朱元璋看向我,“有办法,先弄出点冰来吗?不用多,一小碗就行。”
我快速计算了一下。现在室外温度大概零下五六度,水温接近零度。用硝石溶解吸热,让一小碗水结冰,理论上可行,但需要相对纯净的硝石,和保温措施(减少热量散失)。
“可以试试。”我点头,“用咱们提纯过的硝,量不用太多。找个深点的陶碗,装上干净的水。再把碗放在一个更大的容器里,两容器之间填满硝石和水混合的溶液。硝石溶解吸热,会把小碗里的水热量吸走,只要外面温度够低,应该能成冰。但可能需要点时间,而且冰可能不厚。”
“试试。”朱元璋拍板,“现在就弄。周德兴,去弄点干净的雪化成水。夫人,你准备硝石和容器。”
我们立刻行动起来。找了个相对厚实的小陶碗,装上雪水。又找了个大点的破瓦盆,里面装上雪水和我们攒的、提纯过的硝石(心疼!),搅拌均匀,直到硝石不再溶解,得到饱和硝石溶液。然后把小陶碗坐进这个大瓦盆的溶液里,确保小碗被溶液包围,但碗口高于液面。
“行了,放在背阴通风的地方,别动它。”我拍了拍手,“能不能成,就看老天爷给不给面子,还有咱们硝石的纯度了。”
我们把这一套“土法制冰装置”放在屋后避风处。接下来就是等待。
等待的时间格外难熬。我们仨轮流出去“观察”,其实也看不出什么变化,碗里的水还是水。周德兴急得抓耳挠腮,恨不得把手伸进去摸摸凉不凉。
郭天叙那边也没闲着。下午,他又派人来“传话”,说郭公子体恤下属,知道朱九夫长救火辛苦,特“赏”了半袋发了霉的杂粮面,让我们“补补身子”。这赏赐,侮辱性极强。
朱元璋面无表情地收下,道了谢。等人走了,直接把那半袋发霉的面扔到了墙角——喂老鼠估计都嫌。
傍晚时分,天色暗了下来,气温更低了。我再次去看那个“制冰装置”。
大瓦盆里的硝石溶液,因为不断溶解吸热,已经变得冰凉刺骨,表面甚至结了一层薄薄的冰碴!而中间那个小陶碗……
我小心地端起碗。入手冰凉!碗里的水,已经不再是液态,而是变成了一碗浑浊的、带着许多气泡的……冰坨子!虽然不透明,不美观,还有点软,但确实是冰!用手一按,硬硬的!
“成了!”我低声欢呼,捧着碗冲回屋里。
朱元璋和周德兴立刻围了上来。看着碗里那坨实实在在的冰,周德兴眼睛瞪得像铜铃:“我滴个乖乖!真……真变成冰了!嫂子,你真是活神仙!”
朱元璋拿起碗,仔细看了看,又用手指戳了戳冰坨,感受到那真实的冰冷和硬度,眼中也闪过一丝惊讶和了然。他看向我:“这个,能保持多久不化?”
“只要外面温度低,放在阴凉处,一两个时辰应该没问题。如果放在更冷的室外,或者用棉被包裹隔热,可能更久。”我解释道。
“够了。”朱元璋放下碗,“明天,带着这个,去见郭天叙。”
“直接给他看?”我有点担心,“他会不会觉得咱们在装神弄鬼?或者追问硝石来源?”
“不直接给。”朱元璋摇头,“让他‘偶然’发现。周德兴,明天你想办法,在郭天叙路过的地方,‘不小心’把这个碗打翻,让冰露出来。然后,装作惊慌失措,想要掩盖。剩下的,我来。”
“明白!”周德兴兴奋地搓手,“演戏我在行!保管让他‘偶然’得恰到好处!”
第二天上午,我们按计划行事。周德兴“鬼鬼祟祟”地端着一个盖着破布的碗,在帅府附近溜达。果然“偶遇”了正要出门的郭天叙。周德兴“吓得”一个趔趄,碗脱手飞出,破布掀开,碗在地上滚了几圈,里面那半融不化、依旧冒着寒气的冰坨子,咕噜噜滚到了郭天叙脚边。
正月寒天,地上出现一坨实实在在的
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