Re: gum mixes

[Kees Brandenburg <ctb@zeelandnet.nl>]

hi chris

1. premixed gum: never
2. 300 grams (lumps in cheescloth) plus 1 liter water

Recently I purchased a cheap winemakers hydrometer: http://urltea.com/2f4x 
 It has no baumé scale but degrees baumé can be calculated from the  
specific gravity scale.  Here's a calculator: http://www.ilpi.com/msds/ref/baumescale.html 
, somewhere I found one the other way round too but I don't have the  
url at this moment.

Measured my gum and found it was exactly 14 baumé.

Sentisizer: saturated potassium dichromate in a 1:1 mix for all layers

kees



On 23 dec 2007, at 19:18, Christina Z. Anderson wrote:

> Dear all,
>
> I'm finishing my section on gum thicknesses, and was wondering a  
> question or two of all one-time to inveterate gum printers:
>
> 1.  How many of you are using premixed gum?
> 2.  If  not and you are mixing your own, what dilution are you  
> mixing it at exactly--weight of gum into what volume of water, for  
> instance? If it is 300g in a TOTAL volume of 1 liter, or 300g PLUS  
> one liter please differentiate clearly. If, mixing more than one  
> solution, also state.  If not using gum/pigment 1:1 sensitizer at  
> time of use please note.
>
> Any other practices, I'd love to hear--e.g. using a hydrometer or  
> some such thing. Or if you use dry gum at time of use in your  
> sensitized mix and do not premix a gum solution.  Stuff like that.   
> I've got the timeline almost finished on gum dilutions from  
> beginning til now and I want the "now" as in 2007.  Hopefully this  
> isn't too pointless, misleading, and confusing!
> Chris
>
> __________________
> Christina Z. Anderson
> Assistant Professor
> Photo Option Coordinator
> Montana State University
> Box 173350
> Bozeman, MT  59717
> 406.994.6219
> CZAphotography.com