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Author Topic: Pans vs. Tubes  (Read 1743 times)

Val

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on: November 04, 2011, 01:15:23 AM
I've been told repeatedly that when I use up my pan colours, I can refill them from tubes. I was going to order some and came across an info sheet stating that you shouldn't refill the pans from tubes as the formulation is different, and that rewetting the tube paints causes the binders to break down.
I like the tubes for making large dense washes, I find trying to do it from the pans causes a lot of wasteage.
Is it really that much of a problem?  :confused:
Cheers, Val

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dennis

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Reply #1 on: November 04, 2011, 04:08:28 AM
I know, and  know of, many prominent artists who regularly fill the pans with paint from the tubes, andy they have had no problem with the quality or problems with the breaking down of the binders. There are various types of  binders and one of the most popular is gum arabic. The tube paints normally have a little bit more binder in them than the paint in pans, and as such make them easier to mix. All the components are the same - just in different proportions.

So I ask the question - why would rewetting them cause the binder to break down in the first place, and secondly, why would the binder break down when actually there is more binder in them than the pans? All the components are the same  and when the tube paints dry in the pans they are just the same as the pan paint, only with a bit more binder.

Some manufacturers even add a touch of honey (an anhydrous substance) to the paint to keep them slightly moist.

As can be seen in one of my previous posts I used tube paints squeezed into pans. To keep them moist longer I use plastic pill/capsule holders with lids. I just add a drop of water every so often and then close the lids. Even before using these holder I have never ever had any quality problems with my watercolour paintings.

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Val

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Reply #2 on: November 04, 2011, 09:17:55 AM
Thankyou Dennis, that's good enough for me. It didn't make sense to me but just thought it best to verify and be better safe than sorry. Tubes for me!  :)   :wave:
Cheers, Val

�Creativity is allowing yourselves to make mistakes. Work on knowing which ones to keep!�

- Alvaro Castagnet


Danielle123

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Reply #3 on: November 27, 2019, 01:55:14 AM
Just saw this post, thank you for the info Dennis! because I have been using all of my father in laws old paint for 5 years now and I had to cut the tubes so I could use the dry  paints.  I never had any problems as I too put them in a pill bottle like you.  Nice to know it is ok.   Thank you.


Annie.

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Reply #4 on: December 02, 2019, 04:20:34 PM
I put paint from tubes into little pans and let them dry.  The paint is always smooth and I never had any problems.  Actually the cake of paint doesn't crack as I saw with old pan paints... not that it matter.  It is great for travelling.

I was reading a bit about WC binder and I saw reference to honey, but also glycerin... I am not clear how those are used and for what reason they are added.


dennis

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Reply #5 on: December 02, 2019, 04:58:37 PM
Honey and glycerin attract moisture and helps keep the paint slightly moist and easy to use.  O0
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Annie.

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Reply #6 on: December 03, 2019, 12:01:54 AM
That makes sense, thank you Dennis  :thankyou: