[alt-photo] Re: back again
zphoto at montana.net
Mon Oct 24 00:27:22 GMT 2011
Is that a typo or did you say 40 MINUTES??? OH, paper neg...but wow. I am doing 2-3 minutes under UVBL which at most will be 12 is my guess under a paper neg.
But I also found that it is pretty forgiving exposure wise. Any exposure at all and it is hardy hardy hardy hardly comes off. Of course I don't develop it with alkaline baths, just hot water.
Christina Z. Anderson
On Oct 23, 2011, at 10:10 AM, Matti Koskinen wrote:
> On 23.10.2011 18:37, Vedos Projekti wrote:
>> Moro Matti,
>> You can find gum arabic at Vanha Viljami, Tampere:
>> or ask Yliopiston Apteekki, they can get you it as fine powder (very pure but a bit expensive)... ask for gum acacia (akaasiakumi), or buy it as liquid from Wallun Painotarvike, Tampere:
>> that is what I use, 14 Baume and very consistent... ready to be used straight from the can...
>> Hope this helps,
>> Onnea matkaan,
> thanks Keith and Jalo.
> I think the lines are from uneven coating of casein. I use Laura Backlow's method to the letter. Now just made two new papers and foam rolled the paper using more mixture than earlier and only brushing. Looking against light, they look very even. Now it's time to expose. I made tests to find the best exposure time in 20min steps using a grey scale ramp, and 40 mins gave the best result, although filled with lines, the ramp was quite good, so the negative needs only minor curve correction. Colour I'm using is Van Gogh Patent grey.
> Jalo, thanks for the links. I'm intrigued on casein, because it may give good image with only one coating, and just to practice to get things right, there's no need to waste time with several coatings only to find out, that the print is ruined.
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