13,磨镜之妙(1 / 2)

李玄深知玻璃的妙用,不仅在于做些器皿,更重要的是它将改变炼师的操作方式。目前李玄在丹房所见,炼丹操作,基本上都用土釜、铜鼎、坩埚之类,而且大部分都是密封的,炼师不能够仔细观察鼎中药物的反应,属于“暗箱操作”。一旦有了透明的玻璃容器,低温下的炼丹反应可以被完全地观察记录下来,这种改变将导致炼丹术的大革命。而且关于溶液、气体的反应,将会开创一个什么样的局面,李玄自己也不清楚。眼下,他连一些最基本的炼丹程序都没有掌握,还是先静下心来学点基础知识吧。他强忍住炼制玻璃的冲动,先将那《白雪圣石经》仔细整理了一遍,准备设计出相应的实验步骤,再开始试炼。

恰好师傅第二天上了山,带着挑夫挑了些硫黄、焰硝之类的药物原料,准备制造更多的火柴。李玄却接到了新的任务。

“小玄啊,我门中新进弟子,都要学会磨镜之术。这是当年祖师为了门下弟子即便落难了,也能有碗饭吃,才定下的规矩。你既入我门,人又灵巧,但这门手艺却是要学的。要知道艺不压身,多门手艺,总是有用的。今儿你就跟着你四师兄先学炼制磨镜药,把手艺学好了,过两日跟师兄们一起出去历练历练。”

李玄心道,怪不得三哥上次说这磨镜之道,如何如何地,这样的话,青霞门何不干脆叫“磨镜门”得了。想起磨镜这个词,却又联想到后世的玻璃之爱,心中不觉好笑。

当李玄来到四哥凤磊的丹室时,屋里已经升起了一个小火炉,炉上架着一个坩埚,土根拉风箱,苏柯在旁帮着备料。这风箱现在算是在青霞门里普及了,林瓒大大小小地做了好多个,而且越做越漂亮,箱板上还雕了花,刻了字。

凤磊见李玄前来,便准备开始传授炼药之法。

“磨镜之妙,首在玄锡。此方是我师门秘传,你可别小看了。磨镜之法,首见于《淮南子》,道是‘粉以玄锡,摩以白旃’,所以世间一般的磨镜道人,都是拿着一块粉锡,在镜面上涂了一层,再用力擦拭。这般磨镜,不过三两月,便生锡晕,那镜子便再也照不得人。”

凤磊是个实在人,既然代师授艺,便把那来龙去脉先交待一番。李玄没想到磨镜这活儿还真有些讲究。他在后世喜欢逛古董市场,虽然没钱,却总是想着那天“拣块宝”,一举发达。其中对这铜镜十分痴迷,可惜汉镜唐镜一块都没钱收藏,听到是听了不少。

李玄记得小时候跟老师参观博物馆,看那些出土的青铜镜,无不黑漆漆地,哪里能够当镜子来照人?当时还问老师来着,老师居然不知道,让他幼小心灵深受打击。等自已大了去古董市场,才发现铜镜表面有两种不同的现象,一种黑,一种白,后来终于从镜友口中明白,那黑的叫黑漆古,一般是从地下挖出来的。白的叫水银沁,却是民间流传下来,没有入过土的。可这黑漆古和水银沁,到底是怎样形成的,却没人能讲得清楚。自己上网查,连专家都众说纷纭。原因很简单,铜镜表面抛光的文献记载极少,而且简略。再加上铜镜早就不用了,那磨镜的工艺也早已失传。

呵呵,穿回来了好啊,看看这古铜镜表面处理之谜究竟是怎样被解开的!

凤磊见他神思不定,便正色道:“我师门所传之法,与世间磨镜之法皆不相同。你要记好了。这其中有两点秘诀,一是炼制磨镜药,二便是磨镜之时须用火炀药,磨完之后回火焊药。”

李玄还是不太明白,只得老老实实地听着,这时他一点也不敢有轻视之心了。

这时小炉上的坩埚已经烧得有些红了,凤磊取过一大块黑色的东西,放入坩埚中,不一时,冒出小股青烟,黑色变白,慢慢熔化。凤磊又取过一个小木人来,在坩埚里用搅动,那木人的下端渐渐被烧成黑炭,待取出看了木人身上的刻度,又投入一块赤红色的东西,连连搅动。

凤磊边做边说:“这黑色的是黑锡,红色的便是真丹,此二物各用四两。用此木人作尺,以掌握火候。木人烧尽二寸,再入黑锡四两,如此再搅,便成磨镜之药。”

“黑锡我知道,可这真丹是什么?”李玄问道。

“真丹是丹砂烧制而成,入火即成水银!”凤磊答道。

“水银?”噢,李玄拍拍脑袋,明白了。锡是白色的,再加上水银,不是更白更亮,所以才能照人嘛。水银这东西不能单独使用,因为是液态的,像珠子一样流动,加上锡,不就是了锡汞齐了吗?

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