tag:blogger.com,1999:blog-8581401473844438605.post8378467503792598978..comments2024-03-26T19:46:33.565-07:00Comments on Random Walks: The Science of Investment MaterialsJohn Kurmanhttp://www.blogger.com/profile/04607323621206823686noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-8581401473844438605.post-52208565116852878422017-08-28T17:37:51.827-07:002017-08-28T17:37:51.827-07:00You most certainly may!You most certainly may!John Kurmanhttps://www.blogger.com/profile/04607323621206823686noreply@blogger.comtag:blogger.com,1999:blog-8581401473844438605.post-90057780639524234932017-08-26T10:52:50.910-07:002017-08-26T10:52:50.910-07:00May I email you with some questions and pictures?May I email you with some questions and pictures?Anonymoushttps://www.blogger.com/profile/12546456900367019947noreply@blogger.comtag:blogger.com,1999:blog-8581401473844438605.post-31729597678476477062016-07-15T17:11:11.604-07:002016-07-15T17:11:11.604-07:00Yes, please!Yes, please!John Kurmanhttps://www.blogger.com/profile/04607323621206823686noreply@blogger.comtag:blogger.com,1999:blog-8581401473844438605.post-39594543363202805972016-07-15T09:56:40.397-07:002016-07-15T09:56:40.397-07:00Thanks John. I'm trying to diagnose a defect ...Thanks John. I'm trying to diagnose a defect I've found in gypsum. So far I have pictures of the defect and I know that it is created during an exothermic event. I saw your gmail in your bio, so just let me know if you'd like me to forward my findings.EricMhttps://www.blogger.com/profile/12933894963341189719noreply@blogger.comtag:blogger.com,1999:blog-8581401473844438605.post-80177081959805448042016-07-15T07:49:06.155-07:002016-07-15T07:49:06.155-07:00Hi Eric, I don't know. Google tells me that, i...Hi Eric, I don't know. Google tells me that, in the heat range of a flask prepped for metal, the SO2 and carbon will react to form CO, CO2, and elemental sulfur. That makes sense since you see the result as the black skuzz in non-ferrous metals like copper and silver. My guess is it is not exothermic. Sorry I can't be of more help.John Kurmanhttps://www.blogger.com/profile/04607323621206823686noreply@blogger.comtag:blogger.com,1999:blog-8581401473844438605.post-21567836906411560672016-07-15T07:39:16.925-07:002016-07-15T07:39:16.925-07:00Thanks!Thanks!John Kurmanhttps://www.blogger.com/profile/04607323621206823686noreply@blogger.comtag:blogger.com,1999:blog-8581401473844438605.post-58906763610656661332016-07-14T10:02:04.796-07:002016-07-14T10:02:04.796-07:00Hey John, first let me say thank you. I've pr...Hey John, first let me say thank you. I've probably read this article a dozen times over the past 2 years (rapid prototype investment casting). It's been extremely beneficial.<br /><br />I have 2 questions about gypsum thermal decomp into sulfur dioxide in the presence of carbon. First, do you know if that reaction is exothermic? Secondly, what would the carbon/sulfur dioxide look like if I dissected a flask? EricMhttps://www.blogger.com/profile/12933894963341189719noreply@blogger.comtag:blogger.com,1999:blog-8581401473844438605.post-47098051772269774762013-07-31T11:41:18.363-07:002013-07-31T11:41:18.363-07:00Thank you for posting your most insightful paper, ...Thank you for posting your most insightful paper, I am a sculptor from South Africa who owns a small bronze foundry. Lately I have been experimenting with commercial jewelry investment with great success. I however pay for such investment at a premium and so decided to start researching investment in order to mix my own. Such insightful information as yours are virtualy non-existant on the web. DanieDaniehttps://www.blogger.com/profile/14496568796389477488noreply@blogger.com