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Hi Unregistered,
On July 29th, this site will be moving..! No, really - it's "moving" to another physical location - including servers, gateways, routers - everything - including my coffee cup...
So, from the date of July 29th through July 30 or 31 (shooting for these dates, but - as always, I'm at the mercy of my ISP who has to install the lines to the new location - and we actually get them running ;) ). But - this site, cloud servers and main web will be OFF LINE.
Now, please save these dates!! Please - don't be "that guy" who emails me on the 30th to tell me you "can't open the Parker Website". I'll already know it is offline - and also know that you are "that guy"...
I'll take this notice up and down over the next week or so - and leave it up during the final few days before shutting it off on the 29th..
John D.
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05-26-2018, 03:33 PM
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#51
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Member Info
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Join Date: Jun 2009
Posts: 63
Thanks: 6
Thanked 61 Times in 22 Posts
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Logwood as I recall is from the Campeche tree. It contains Haemotoxilin a strong black organic dye that attaches naturally to iron. Thus it's use in microbiology. So yes if it's oxidized off then it leaves little black behind. I agree that the photos show great contrast. But the black oxide you have created is very unstable and will decay quickly (relative term) from the ferro ferric oxide to ferric oxide or rust. This does not happen from an appearance perspective with Haemotoxilin present because it remains carbon black in color regardless of the conversion of the oxide. I wrote this from memory so forgive me if I've mis-spoken.
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05-26-2018, 03:48 PM
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#52
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Join Date: Mar 2018
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Very interesting Harry. Thank you. That is good to know. I'm going back to using logwood. My eye couldn't see much difference, but I guess there is after all. I appreciate you explaining this to me. Now if you can just find an etching agent that only works on the steel and not on the iron. I guess it doesn't exist or someone would be using it by now.
But that would be the holy grail.
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