[KwartzLab] Paper Marbling Workshop: Sun Jan 29 1-4pm
agnes.niewiadomski at gmail.com
Thu Jan 19 00:46:30 EST 2012
I found this document online from Golden
Are your techniques similar? Is the alum a necessary part?
Yes, I believe the Magic Dip paints are oil based. I think I may have one
bottle that hasn't dried out. I'll bring it to the lab next time I'm at TON.
On Wed, Jan 18, 2012 at 7:27 PM, Robert Gissing <rgissing at gmail.com> wrote:
> Borax is a flux used in blacksmith forge welding. that should make this
> even more confusing . ;-)
> On Jan 18, 2012 5:27 PM, "Kevin Martin" <kpmartin at thinkage.ca> wrote:
>> I just found a page that states
>> "Borax is used as an agent that breaks the waters surface tension and
>> lets the paint spread out over the surface" which would imply that it
>> *reduces* the surface tension...
>> The article I found implies that oil-based paints are being used in their
>> process (to "swirl" guitar bodies). The article James found was referring
>> to marbling using powdercoat paints in the form of a water-based slurry and
>> again, the borax seems to be there to encourage the paint to spread.
>> I think the effect is that the borax reduces the surface tension between
>> the water and the paint/particles rather than having any effect on the open
>> surface tension (between the water and air). This makes it energetically
>> advantageous for the paint or particles to spread out on the water.
>> So perhaps the Magic Dip kit uses oil-based paints (which would also
>> explain how they can claim to marble non-absorbant surfaces). Perhaps any
>> alkali such as soda ash or TSP would work as well as borax does by
>> (slightly) saponifying some of the oily materials in the paint.
>> Then again I've also found a reference to using borax to preserve the
>> thickener used in the water (to prevent fermentation), and also to "soften"
>> the water (i.e. reduce the effects of dissolved mineral content). Perhaps
>> the borax also interacts with the resins in the paint (as one sees in the
>> "flubber" recipes that combine white PVA glue and borax).
>> In the case of marbling with water-based paints (acrylics or
>> watercolours) there is almost zero surface energy between the paint and the
>> water, and the paint spreads because it contains surfactants so the
>> paint/air surface has less energy per area (and thus less surface tension)
>> than the water/air surface it is displacing. As a result nothing is needed
>> in the water to adjust the spreading. There is however, stuff in the water
>> to increase its viscosity to make it easier to control the patterns formed.
>> Having said all this, though, I might try adding borax to my tray water
>> someday to see what effect it actually has on the paint.
>> -Kevin Martin
>> the Papertrail Handmade Paper & Book Arts
>> New Dundee, Ontario
>> -----Original Message-----
>> From: discuss-bounces at kwartzlab.ca [mailto:discuss-bounces at kwartzlab.ca]
>> On Behalf Of James Bastow
>> "The Borax will increase the surface tension of the water to the point
>> that it becomes almost like a film, yet it will not contaminate your
>> MARBLING: The How To Guide <
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>> Discuss at kwartzlab.ca
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