Re: relief

Halvor,

In context:

At 07:17 AM 12/15/2004, you wrote:
>Richard Sullivan wrote:
>>Halvor,
>>I'm following your adventure with interest.
>
>thanks, and let me add an extra thanks for keeping that website (and not
>selling mopeds), I have been reading through your tech section several
>times the last years.

We are in the processes of a major revamping of the site.

>>That 3 mm is a wet coat, right? How do you measure it wet?
>
>yes, "wet" or gelated as in "solid" gel with water, eh.. names of tools is
>a bit missing from my vocabulary in english.. right, and 5 online
>dictionaries refused to translate it. basically a ruler, with a moving
>part - at one end clamps measures with, other side "insides" as in screw
>holes diameter, on the other end depth, precision is 0.01 mm, normal tool
>for metal work. a "pushing ruler" would be a logical translation from
>Norwegian.
> Clearly a case where a picture would have helped.
>
> (Also of course, it is a function of volume - 30x120x3 mm is
> about 11 ml, say 15 ml, as this is thick and a few ml sticks in the
> "another word missing" - measure up/make up, a dam or mold with clay,
> suitable for size of the the test, on a piece of glass, make marks in the
> clay for wanted thickness and pour in the gel.)
>
>bit tired here that got confusing..
>
>>As for getting a high relief I think it is a function of dichromate
>>concentration, pigment concentration, and tissue thickness.
>><Dichromate, >relief
>><Pigment, >Relief
>> >Thickness, >relief
>>I believe this was referred to as "carving depth" by latter day carbon
>>folks. Too much pig and dichromate and you don't have the light
>>penetrating very deep into the tissue and thus less relief.
>big ear waving

Waving back!

>>I've not tried to make a high relief tissue yet on my machine. It's one
>>of the ideas I need to explore in the future. It may prove to be
>>impractical as a machine made product. THis may be one advantage to
>>making lay-down tissue.
>>--Dick
>
>would like too see that machine, but bit far away,, while I think it could
>be done, it would probably be messy & slow,,,
>
>it is still early with my tests, have had a bit of a multiple errors
>situation for a while and did first today/ystrd start to get results that
>looks reasonably similar to a step tablet.
>
>are right now using that wet exposure simply to save time and avoid some
>problems with dark reaction, at least one of the gelatin types I have here
>is not good for long drying times. will look closer at that later, but
>need to get a basic procedure up and running before optimisations.
>
>the test mentioned yesterday; I did have a better check of the thickness ,
>after drying, with a micrometer, the 30 min exposure gave a 120 micron
>thickness, the one hour exposure gave 330 micron, that is 0.12 mm and 0.33
>mm (if I take off that white coat), now as said, my working method is
>still a bit rough, but this looks like it could make sense taking into
>account that the first test was dumped into cold water after dev, although
>I read somewhere that this was recomended for preserving the relief,
>transfering photographic gelatin products (film) from hot water to cold
>water is at least in normal black and white wrong, what is the word
>"cracilation" ? the swollen gel was not entierly happy about that. got a
>bit wrinkled.
>
>the second test could also maybe have stayed a bit longer in the "dev".
>
>will try again next week, with a sequence of 30 min, 1 hour, 2, hour and 4
>hours and see how it goes, if 8 hours seems like a possiblity, I can
>probably just as well start drying the tests to start with, as I am not
>going to save much time anymore....

I am having a bit of trouble following you on this.

>One question, The Woodburytype mentions a development sequence of first
>cold water until the dichromate is cleared out then increasing temperature
>for development, is this neccesarily ?
> To get rid of left over dichro into one water bath would simplify
> the enviormental concerns (of this school, I have none, (I do doubt that
> me releasing 0.1 gram dichro a day mixed to infinity with water is that
> bad, but..)) but does for a dry gel of this thickness take several
> hours.. overnight seems to be the easy but slow solution...

What info do you have on making Woodbury plates? Can you cite on details?
Would love to see what you have.

>I will be offline for some days, will try to limit the lenght of these
>mails in the future, sorry.. once I start writing I tend too keep on..
>
>but thanks for listening
>Halvor

You bet.

--Dick

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Received on Wed Dec 15 07:40:32 2004