 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
| HomeDiscussion Groups General ModelsRailroadsRocketsRadio Controlled Air ModelsHelicoptersLand ModelsWater ModelsModelGeeks.com Contact UsLink To UsSearch & Site Map |
Model Forum / General / Models / December 2006Discoloration on granite surface plate
I left a stainless steel based height gauge (current affordable Asian DRO type) on my dark granite surface table for ~6 weeks. I now find that just where the stainless steel base contacted the granite, it's markedly lighter in colour. The area between the two legs of the base is the same colour as the bulk of the table, so the discoloration is confined to places in contact or very close to being in contact. (There doesn't appear to be any oil/grease treatment on the stainless steel surfaces, but would I detect any anyway?) Do I just ignore the colour change - I can't feel any difference in surface texture, but then I've no idea how sensitive my delicate finger tips are!! (i.e. I'm not a builder with hands ravaged by cement etc.) Cheers,  SignatureM Stewart Milton Keynes, UK -- Posted via a free Usenet account from http://www.teranews.com > I left a stainless steel based height gauge (current affordable Asian DRO > type) on my dark granite surface table for ~6 weeks. I now find that just [quoted text clipped - 12 lines] > > -- I cant find the reference (its on the web somewhere...) but Im pretty sure an average fingertip is capable of detecting a difference of much less than a thou, more like a ten thousanth IIRC, especially on a smooth surface. Until someone more knowledgable comes along and says other wise I wouldnt worry to much about it, especially if it stil feels ok. I assume the box you normally keep the comparitor in is showing any signs of deterioration? It might be as simple as the sweat from your hands causing the discolouration? Dave > I left a stainless steel based height gauge (current affordable Asian DRO > type) on my dark granite surface table for ~6 weeks. I now find that just [quoted text clipped - 8 lines] > texture, but then I've no idea how sensitive my delicate finger tips are!! > (i.e. I'm not a builder with hands ravaged by cement etc.) What are the lighting conditions? The granite work surfaces in our kitchen have darkened over time, with light patches where there are mats. A wipe over with the sealer we were supplied lightens the main area a little, but colour differences remain ;) SignatureLester Caine - G8HFL ----------------------------- L.S.Caine Electronic Services - http://home.lsces.co.uk Model Engineers Digital Workshop - http://home.lsces.co.uk/ModelEngineersDigitalWorkshop/ Treasurer - Firebird Foundation Inc. - http://www.firebirdsql.org/index.php >> I left a stainless steel based height gauge (current affordable Asian DRO >> type) on my dark granite surface table for ~6 weeks. I now find that >> just where the stainless steel base contacted the granite, it's markedly >> lighter in colour. > What are the lighting conditions? > The granite work surfaces in our kitchen have darkened over time, with > light patches where there are mats. A wipe over with the sealer we were > supplied lightens the main area a little, but colour differences remain ;) I've kept the surface plate in what used to be my photo darkroom (and there hasn't been an acetic acid smell for years!) i.e. it's the small ch radiator heated utility room with a permanently blacked out window, so no direct daylight, and only occasionally light from fluorescent tubes. 3 quadrants of the plate were covered with a thin opaque Teflon sheet and the height gauge stood in the remaining quadrant - open to dim light, dust, any domestic fumes (perfume from clothes detergents, gas boiler some distance away and well ventilated) etc. The discoloration is quite closely aligned with the shape of the feet of the gauge, and there's no hint as to where the edges of the opaque sheet lay for the 6 weeks. Definitely seems to be a feature of long term contact with stainless steel. Must take a snap with some form of grey scale in shot as an indicator - in case it does recover. Cheers, SignatureM Stewart Milton Keynes, UK -- Posted via a free Usenet account from http://www.teranews.com > I left a stainless steel based height gauge (current affordable Asian DRO > type) on my dark granite surface table for ~6 weeks. I now find that just [quoted text clipped - 8 lines] > texture, but then I've no idea how sensitive my delicate finger tips are!! > (i.e. I'm not a builder with hands ravaged by cement etc.) Mine is discoloured by prussian blue ;-) BugBear |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2012 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.