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-   -   Sodium Hydroxide (http://www.film-and-darkroom-user.org.uk/forum/showthread.php?t=10720)

alexmuir 5th November 2015 01:56 PM

Sodium Hydroxide
 
I am planning on making a Thiocarbamide toner to a recipe I have in one of my books (also in an old post here). I need sodium hydroxide which is the proper name for Caustic Soda. Can I use one of the readily available packages of this chemical, or should I be looking for a particular quality? Some versions available online are labelled 'pharmaceutical', or 'lab' grade. Thanks for any advice,
Alex.

paulc 5th November 2015 02:42 PM

I recently purchased 500g of Sodium Hydroxide from Boots the chemist. The label states 98% purity which is as good as lab grade from Sigma Aldrich and less than tenth the price. Works just fine for lith developers, which is what I got it for,

For most photographic purposes, high purity analytical grades are not required.

alexmuir 5th November 2015 05:13 PM

Thanks, Paul. That sounds ideal. Will go to Boots tomorow.
Alex

LarsAC 6th November 2015 06:15 AM

I bought NaOH as a 10% solution which is fine as a solution for thiocarbamide toners.

I found the bleacher recipes quite strong. Dilute further for better control of highlights.

Lars

Adrian Twiss 8th November 2015 09:09 AM

I am finding it increasingly difficult to get raw chemicals from chemical suppliers as opposed to photo supplies dealers. Many will now not sell to private individuals. Certainly you will struggle to get either potassium or sodium dichromate as apparently it is now illegal to sell these to the general public.

I ran out of sodium hydroxide when I wanted to make some thiourea toner and went to my local hardware store and bought caustic soda at a very reasonable price. To my surprise it worked very well.

Apropos Sigma Aldrich they agreed to send me a statement of use form so I could set up an account with them but they never bothered.

paulc 8th November 2015 10:44 AM

Quote:

Originally Posted by Adrian Twiss (Post 105549)
Certainly you will struggle to get either potassium or sodium dichromate as apparently it is now illegal to sell these to the general public.

Potassium/Ammonium Dichromates are regularly listed on ebay along with many other "restricted" chemicals - More often than not, smaller quantities will be sent out to you via Royal Mail :eek:

Terry S 8th November 2015 02:35 PM

Quote:

Originally Posted by paulc (Post 105520)
I recently purchased 500g of Sodium Hydroxide... Works just fine for lith developers, which is what I got it for...

As a lith person myself, who also likes to make up his own developers etc. have you any 'recipes' that you can pass on that you know that work Paul?= I say this as I've tried quite a few I've found in books or on the web but most don't give very good end results at all...

Many thanks,

Terry S

Terry S 24th October 2020 01:17 PM

As I'm just getting back into trying toning again, I thought that I'd resurrect this thread.

I bleached some strips of photographs for varying amounts of time yesterday, for which I've carefully followed a much printed 80% thiourea and 20% sodium hydroxide mix. In the pictures and written descriptions, there is definitely supposed to be a yellow range of tones. Whatever the length of time that I've left bits in the bleach for, I'm getting a definite warm and light sepia brown, on various RC and FB papers tried.

Reading the information, this warm brown / light sepia, should be at the other end of the scale, when using a thiourea @ 20% and sodium hydroxide at 80% mix. All solutions have been quite diluted, as stated, to make up a litre of working solution of the two chemicals.

I'm going to try some full size prints this afternoon regardless, but I wondered if anyone else has done some of this type of toning and may have any comments or tips, that may be of help to me?

Just browsing, the picture on this site is the sort of tone that I was hoping to get:

https://www.moersch-photochemie.de/c...en/113/lang:en

Terry S

Martin Rick 25th October 2020 10:44 AM

Btw, photographic grade chemicals are at best tech pure and any grade will basically do. For caustic soda, one of the cheapest sources is caustic lye 40%, used for cleaning drains.

Terry S 25th October 2020 01:06 PM

Thinking about it now, I think maybe I should have started a new thread with my question, under a different title?

So, sorry if you read the above text again, but hopefully more members will see it and respond. :)

Terry S


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