二百三十节 旅游动机
最新网址：m.ltxsdz.com
“哦？还请不吝赐教！”张岱多读“髡书”，知道澳洲人对于原理一类的东西并不藏私，但是具体做法往往避而不谈。当年一本《光学初论》只讲原理不讲工艺，可把社中几位给吊的馋死，最后不得不托人来广里寻购书中所说的各种镜，只是还未有消息，自己就南下了，也不知他们是否得偿所愿了。不过就自己这段时间于市面上所见，广里大约是没有的，真要买只怕还是要去临高。
“所谓陶土，本质上讲其实是石头末子。”刘三一开口就觉得心好累：跟张岱讲陶土的化学成分那必然是原始天尊讲道，一个说天书一个听天书。
“放到窖中烧，也就是把它烧化，重新凝聚成型。釉彩也是如此，本身是一些彩色的石头，当然，在高温环境下它会发生一些变化，通常是还原反应――哦，这个你不用在意，反正就是物性发生了改变――因此釉彩本色与烧制后的颜色大多是不同的。”
张岱听了这段后非常无奈：他也知道肯定是物性有了变化，那么关键就是那个什么反应了，然而刘元老却是不愿意多说。这种不愿意，不是怕泄露了秘密的那种不愿意，反而是一种不耐烦的不愿意，就好像在文会上某人提出了一些蒙学上就该掌握的问题，其他人懒得搭理一般。张岱难得被归类为一个无知之人，心中自是不快，略点点头附和了一下，继续听着刘三说话。
“但这不同釉料，熔化的温度可不一样。”刘三说到这里，又想起张岱可能没有温度概念，便又解释了起来:“如果把水结冰的温度定为0度，水烧开的温度定为100度，那么有的釉彩可能要七八百度才熔化，有的则要上千度才熔化。”
“水烧开了，温度就不会再上升了么？”张岱突然问了一句。
刘三倒是被问住了――水温到了沸点开始汽化，温度不再上升对他来说是个常识，但如何证明？好像的确没看到过哪本书深入浅出的解释过。在古代没有温度计，温度只有高低之分。难以确切的量化，更没法解释了。但也不能当面就不解释了，刘三很机智地立刻接口答道:“确实不再上升，但原理解释起来很花时间，咱们还说这釉彩的事。不同物质熔点不同，日常里也不是看不到，张先生随便找个铜匠银匠一问便知：锡铜铁三物放在同一个坩埚里烧，必然是锡先化，然后是铜，最后是铁。”
锡比铜先化，这张岱倒是知道，点了点头不再打岔了。
“釉料也是如此，你说的那个杯子我也知道，内外两色嘛！肯定有一个是高温釉料，一个是低温釉料，先烧高温的，再烧低温的，自然不需要留芒口了。”刘三一口气把谜底揭了开来。
张岱听了心中细想：先烧一种色，没涂料的地方就是支撑点，再烧“低温釉料”，那烧好的釉面就是支撑点。果然不需要芒口、支钉！只是要烧两次，成本高了不少。他那个下马了的项目，只烧一次，成品率都那么低，要烧两次的话只怕早就被家里停撤了。而且这刘元老道理说的够明白，却还是和《光学初步》一样没什么鸟用：一窖起烧后，如何控制温度？不同釉料的那个什么“熔点”又是多少？自己要是细问的话，且不说这个澳洲人的杏林妙手懂不懂，就算懂，也不嫌麻烦地给自己说起来，只怕自己也听不太懂。
“器物精妙一道，澳宋果然甚之甚矣！”张岱恭维了一句。
终于等到这句了！刘三心中一喜，立刻故意追问道:“先生莫非以为这不过是奇技淫巧，与生民无益？”终于可以带进原先预备好的节奏了！
这句略微有些欲加之罪的问话把张岱弄得一楞，不过细想一下，这等技巧除了做些奢侈品，好像确实与民生无益啊！难道还有什么说道？张岱倒是来了兴趣了！
“在下并无此意，不过……愿闻其详！”
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