Scientific methods

[Gavin Nugent]

I am appealing to those of a technical background or insight here.

I am interested to know what, if any, scientific method/s might be available to see and photograph rubbed gold residue on blades to obtain a full image of worn cartouches?

I ask as I have what I believe to be a very important blade that with the visible gold can only offer a partial translation of two cartouches and nothing of the third.

Any direction to methods, persons or institutions that can offer help would be greatly appreciated and I am sure others here who have similar questions and could surely benefit.

thanks

Gav

[Rich]

Don't know how deep the cartouches are, but with Japanese swords it's common to sprinkle with talc or baby powder, lightly brush or shake it off to enhance the signature. Might (?) work for your blades???

Also maybe a pencil or charcoal rubbing on paper might be more readable than the original on the blade. Just a thought.

Rich S

[Gavin Nugent]

Hi Rich,

Thanks for coming in on this.

These cartouches are applied gold in the Koftgari manner and worn in places but the incised lines are still present so I am remaining hopeful that there is a method/s that highlights any residue in the grooves to offer a better outline of the writings not seen to the naked eye.
I am going to the stamp shop for a black light to see if this suggested methods works too

Gav

[Spunjer]

Hi gav,
Photoshop can do wonders. Sometimes i would see stuff after taking pics on higher megapixels, then enhancing the picture further...

[Gavin Nugent]

Originally Posted by Spunjer

Hi gav,
Photoshop can do wonders. Sometimes i would see stuff after taking pics on higher megapixels, then enhancing the picture further...

Thanks Ron. I have done this with good results thus far as the residue showed as a nice blue colour on the steel, I was then able to print the image and line draw on the print out from what I viewed on the screen...I will continue to try this method but I fear there are just a few key sections on the edges of the cartouches that I just can't get clear enough....maybe a lot easier if I had an A3 printer rather than the A4 one that everyone seems to have at home.

Gav

[mrwizard]

It is a bit tedious but examining the surface with a simple microscope might help on the unreadable sections. I'm sure if you ask politely, someone from the university of Queensland will help you with access to the right equipment. I would start asking a mineralogy or materials science department.

Best Regards,
Thilo

[Gavin Nugent]

Originally Posted by mrwizard

It is a bit tedious but examining the surface with a simple microscope might help on the unreadable sections. I'm sure if you ask politely, someone from the university of Queensland will help you with access to the right equipment. I would start asking a mineralogy or materials science department.

Best Regards,
Thilo

Hi Thilo, thank you for a great suggestion!
I recently sold an item to a chap in the Physics dept at UQ...I hope he is receptive to the idea and can offer direction.

I'll let you know if I have success with this method.

Gav

[fearn]

Hi Gav,

Talc isn't a bad idea. Check out the techniques for seeing the images on old gravestones and petroglyphs. Basically, use a non-staining fine powder that has a color in contrast to the surface, to fill in the grooves and make them more evident.

Alternatively, light the piece from a low angle, along the blade (like the setting sun), so that the shadows from any grooves or ridges stand out.

So far as the microscope goes, you want a dissecting microscope, not a compound microscope. If you can't get anything from the physicist, you can often buy one surplus for well under a thousand dollars. Or if that's too much, there are number of simple magnifiers (for jewelers, fishing fly makers and other hobbyists) which would work too.

Best,

F

[katana]

Hi Gav,
I recently purchased a USB Digital Microscope....with a mag of up to 200x . It is fantastic, allows you to take snap shots via the PC. I highly recommend one...and they are relatively cheap (around £60 ) When I get a chance I will add some images created with the microscope so that you can see the results

I do not think talc would help much, wouldn't it just highlight the cross hatching to which the gold is applied or am I mistaken

Kind Regards David

[fearn]

Originally Posted by katana

Hi Gav,
I recently purchased a USB Digital Microscope....with a mag of up to 200x . It is fantastic, allows you to take snap shots via the PC. I highly recommend one...and they are relatively cheap (around £60 ) When I get a chance I will add some images created with the microscope so that you can see the results

Hi David,

Which brand of microscope? There are a bunch out there, and some seem to have gotten bad reviews.

F

[katana]

Hi Gav,
here are some quick images including a blade, stitching and woven reed pattern (reeding less than 0.75 mm in width) on an african scabbard, a British 50p piece, human hair and a metal tape measure (each graduation = 1mm)

I am suitably impressed

Regards David

.

[mrwizard]

Hello everybody,

USB microscopes can be really fun and may even be sufficient for the task at hand but everthing written on the box should be taken with a containership-load of salt.

Here is an article that explains some of the principal constraints http://www.msscweb.org/public/articl...nification.pdf

My guess the optical magnification of most inexpensive usb-microscopes is in the range of 20x-30x.
Another concern is the Depth of Field which is likely very small. Again, these things are fun might be sufficient for what Gav wants to achieve.

I personally own a Lomo MBS-10 microscope that i use regulary for hobby purposes. The thing is build like a tank and has good optical components. Still I don't get much more out of it than 100x. I wouldn't even dare to compare it to the modern scientific microscopes found at most universities.

@Gav: Don't buy any microscope if you don't plan to use it regulary.

Best Regards,
Thilo

[fearn]

Thanks Thilo,

I was thinking of a substitute for a dissecting scope for botanical work, as well as looking at collections.

Best,

F

[katana]

As Thilo has stated, the 200x mag seems a little exagerated (I never believed it would be that good) but, nevertheless certainly seems to be at least 30x. The pictures I have posted are not 'photoshopped' ....so there is further 'scope' to improve the pictures. The illumination is provided by LED's intergrated into the 'telescope' and seems to be sufficent without causing glare from shiny surfaces.

They certainly are 'fun' though and bought it to investigate some of my collection.

Regards David

[Gavin Nugent]

Rich, Ron, Thilo, Fearn, David, thank you all so much for your input and directions with these matters, great case solving!!

I will on my next trip to the PC shop buy one of these USD microscopes, even if I do not get maximum use out of it I am sure the kids will over time, such a great idea and I had never heard of one either.

I'll pursue bigger and better uni ideas too. I do not know if such tools are available but to get the whole cartouche under the microscope at once and to be able to print from it too would be the best....I'll let the fingers do the walking through the phone book Monday morning and make some enquiries.

I think non member readers will be just as 'chuffed' as I am about this help.

Cheers

Gav