What is the effect? Does it bleach everything but the marked locations?
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----- Original Message ----
From: karl shah-jenner <shahjen@xxxxxxxxxxxx>
To: List for Photo/Imaging Educators - Professionals - Students <photoforum@xxxxxxxxxxxxxxxxxx>
Sent: Tuesday, April 15, 2008 7:02:09 AM
Subject: Re: Potassium Iodine and permanent marker?
: I had a student pose an alternative process question for which I
: cannot answer.
:
: Does anyone have an idea of what this student is referring to?
:
: " There was a technique I learned in high school which I'm pretty sure
: is called
: photo bleaching. It's where you draw over a black and white photo in
: permanent
: marker then let it sit in potassium iodine or some chemical. I was
: wondering if
: you were familiar with this technique, and if so, if you could help me
: obtain
: the materials I would need and teach me the exact process. I wanted to
: use this
: technique in my final black and white photography project."
oh man, I thought that was *my* secret trick!
:)
it was something I reserved for the graphic design students who took photo units!
Yes - draw away happily with a permanent marker then soak the print in either of :
Bleach 1
Hydrochloric acid (30% solution) 200ml
Copper sulphate 200g
water to make up to 1 litre
Dilute the bleach 1:10 for use and soak prints before placing them in the bleach to ensure consistent bleaching
Bleach 2
Potassium Ferricyanide 50g
Potassium Bromide 50g*
Water to make up to 1 litre working strength
Bleach 3
water 500ml
Potassium bichromate 5g
Hydrochloric acid (35%) conc. 40ml
Dilute the bleach 1:10
Bleach 4
Potassium permanganate bleach
Part A
5g potassium perm & water to make 1l
part B
HCl 80ml & water to make 1l
add 1 part A & 1 part B & 6 parts water prior to use
Bleach 5
Potassium iodide 16g
Iodine 4g
water to make 1 litre
dilute the stock solution 1:20 for use.
After reduction, rinse then re-fix, washing well after fixing.
Some staining may occur, removable by soaking in a 5% sodiuum sulphite solution.
The Iodine bleach (5) is the most prone to staining and is probably the most expensive to make (the iodine costs $$$) - bleach 1 is the cheapest and probably the best for the intended application
have fun! :)
From: karl shah-jenner <shahjen@xxxxxxxxxxxx>
To: List for Photo/Imaging Educators - Professionals - Students <photoforum@xxxxxxxxxxxxxxxxxx>
Sent: Tuesday, April 15, 2008 7:02:09 AM
Subject: Re: Potassium Iodine and permanent marker?
: I had a student pose an alternative process question for which I
: cannot answer.
:
: Does anyone have an idea of what this student is referring to?
:
: " There was a technique I learned in high school which I'm pretty sure
: is called
: photo bleaching. It's where you draw over a black and white photo in
: permanent
: marker then let it sit in potassium iodine or some chemical. I was
: wondering if
: you were familiar with this technique, and if so, if you could help me
: obtain
: the materials I would need and teach me the exact process. I wanted to
: use this
: technique in my final black and white photography project."
oh man, I thought that was *my* secret trick!
:)
it was something I reserved for the graphic design students who took photo units!
Yes - draw away happily with a permanent marker then soak the print in either of :
Bleach 1
Hydrochloric acid (30% solution) 200ml
Copper sulphate 200g
water to make up to 1 litre
Dilute the bleach 1:10 for use and soak prints before placing them in the bleach to ensure consistent bleaching
Bleach 2
Potassium Ferricyanide 50g
Potassium Bromide 50g*
Water to make up to 1 litre working strength
Bleach 3
water 500ml
Potassium bichromate 5g
Hydrochloric acid (35%) conc. 40ml
Dilute the bleach 1:10
Bleach 4
Potassium permanganate bleach
Part A
5g potassium perm & water to make 1l
part B
HCl 80ml & water to make 1l
add 1 part A & 1 part B & 6 parts water prior to use
Bleach 5
Potassium iodide 16g
Iodine 4g
water to make 1 litre
dilute the stock solution 1:20 for use.
After reduction, rinse then re-fix, washing well after fixing.
Some staining may occur, removable by soaking in a 5% sodiuum sulphite solution.
The Iodine bleach (5) is the most prone to staining and is probably the most expensive to make (the iodine costs $$$) - bleach 1 is the cheapest and probably the best for the intended application
have fun! :)
