There is a new acrylic on the market that stays open longer and can be re-wet the next day. I haven't tried it yet because I have never had a problem with acrylics as they are.  They have a good FAQ page.

Q Why is Interactive different to all other acrylics?

A. Conventional acrylics have always dried too quickly, with no transition stage between wet and dry so that most painting are wet paint applied over dry. Atelier Interactive however, does not form a skin during the drying process so there is a ‘window of opportunity’ at the transition stage between wet and dry allowing you to rework the paint.
Q. How fast does Interactive dry?

A Interactive dries at the same rate as any conventional acrylic but dries differently. This difference allows you to rehydrate the paint when you want to continue working wet–in–wet.

Plus a lot more.
http://www.chromaonlinenew.com/index.php/chroma/products/atelier_interactive/interactive_faq

They also have some new painting mediums.
http://www.chromaonlinenew.com/index.php/chroma/products/atelier_interactive/mediums

I have tried these, and was not too thrilled about them. Yes, they stay wet longer, but did not care for the feel or colors much. Still have them and will use them for studies.

While they can be "unlocked" with the rubbing alcohol they offer, but it is not the same as using paint or removing with a knife. Also was unhappy to leave any of the alcohol residue on the painting surface.

Bottom line for me...the paint did not stay wet long enough to warrant buying them. They also felt thin to paint with...perhaps great for glazing(?)

Just one user's opinion  :)

Now that was some news I can use!! Thanks Diane.

I hadn't tried them and the hype on their FAQ sheet set me back a little.
You tested it and I believe what you have said.

Alcohol isn't bad for acrylics, when you paint in the snow you have to add it to the water so it won't freeze. Ammonia isn't bad either, it keeps mold from forming on the wet pigments in storage jars for commercial tee shirt printers. I spray my airtight palette with ammonia when I close it for the last time each day.

I am planning to order and try some Interactive .

I really like their Permanent Alizeran - it makes a beautiful lavender when a tiny touch is mixed with Phlalo Blue and Titanium White (not Atelier products).

I have just ordered some Atelier Magenta and Phlalo Blue to use as primaries so I will let you know how I get on. (My yellow primary will be a Windsor and Newton Galleria product).

I do use the Atelier mediums - their retarder, their liquidizing medium etc, and do find it makes a big difference in drying time on the non Atelier paints. (note - do not use retarder in the winter!  ;) )

M

Hi Merran, Thans for posting. Have you looked at the ingredients for Alizarin? It has some qualities of PR122, that's good, all the other pigments in it diminish it's qualities, if I remember right it also includes black. It changes from a mass tone cool to a top tone  tint warm. Once you have magenta PR122 you won't use Alizarin again.