Printers Ink?

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It is funny how the same misconceptions are repeated over and over ad infinitum. I cannot speak for anything but the old Rose powders and the original printer's ink sold by Phil Kessling. I have used them both over the years. Many years ago (in a past life) I worked for the American model paint company Testor. It was while working there that the head chemist explained metallic paints to me.

First off, the use of "white spirits" (called 'paint thinner' here in the U.S.) as a "medium" for printer's ink is dead wrong. White spirits are NOT a paint medium! They are a solvent for oil based paint and paint mediums. If you mix paint thinner with the old printer's ink, you will only end up with a dull finish that will rub off without any provocation whatsoever. If that is the result you are after, then you have missed the point of the stuff completely.

The beauty of printer's ink is that it CAN result in a brilliant smooth and reflective finish. But this will only happen if you use a proper paint medium as a carrier for the metallic powders. That is what the rose powders are. The printer's ink is simply a powder suspended in a neutral medium. It is not paint, nor is it a proper carrier for suspension of the fine metallic powder. That is why thinner will neither bind it nor suspend the powder to release its brilliance. For that to happen, you need to suspend the paste in a proper clear glossy paint medium. Liquin may work for this. I do not know because I cannot paint a lick with oils and have never used the stuff. Whatever you do, DO NOT use matte clear paint unless you want a dull finish!

Rose did produce a medium for use with their metallic powders. It was nothing magical. It was simply a clear enamel paint. You can get the same stuff by buying a tin of Humbrol clear gloss paint. This will work fine for a paint medium for both powders and printer's ink. It's only disadvantage is that clear enamel is prone to oxidization and will yellow and turn to a carmel color over time. That is why the Testor metallic paints used a lacquer based medium - no yellowing. When I use the Rose powder or printer's ink, I use the clear medium in a bottle of Testor gold paint. With the powder settled to the bottom of the jar, you simply wick the medium off the top of the bottle with a paint brush. This resulting PAINT, can then be thinned with paint thinner if needed.

The overall brilliance of the final paint finish with metallic paints is due to a process called "leafing". Leafing occurs when the powder in a paint medium migrates to the surface of the paint film. This happens readily with clear paint mediums that are slow drying. That is why oil based mediums work better than acrylic ones. Acrylic paint dries so fast that it does not allow much leafing to occur.

I hope this helps...
 
Great explanation Mike. Very clear and concise. As a dinosaur of the printing industry, I can confirm that we also used cobalt driers, back in the day.
It may interest people to know that, the original way of getting a gold or silver finish in the print industry, was to print the text and then dust it with gold or silver powder before the base ink dried.
It was a union rule that, when doing this dusting, the employer had to give the person doing it, a pint of milk to drink!
Once the toxicity was realised, the use of cobalt driers was brought in, so that when mixed with the paste/powder, it could then be used on the printing press as with other inks.

Ron
 
Hi Brian
Ive got the paste printer inks in all colour Golds as well as a silver many moons ago, also stu gave me some of his inks dilluted in a bottle at Euro. ( Thanks again Mate!)
they are superb! i agree the paste type inks last for ages but the stormtrooper inks are just as good!. Ive got all theRose gold powders as well as a silver powder , ive always used Winsor and newton gold size as a mixing agent for pastes and powders and works just fine.Stu's inks just go straight on as they are dilluted, and i add just a bit of gold size to help them dry and they do not rub off when dry! they still have there sparkle, but i have to agree with Mike you need to mix them with some kind of meduim.
 
As a dinosaur of the printing industry
Does that make you a letterpress man?

Spent many years as a litho minder - ended up in security printing (credit and phone cards).

Kudos to Mikes post - all that I can add is that inks are generally designed for a particular purpose. Unless you know the material that it was designed sit on, sink in, or dry on, its very hard to set a hard and fast method to carry that formula in a medium/tempera, as the chemistry is so diverse. It may not be compatible. Better to find a metallic flake that can be carried in medium who's drying characteristics are tried and tested.

Rich
 
As a dinosaur of the printing industry,

Ron


handprints.jpg
 
Hi Rich, yep Letterpress apprenticed and served, then onto Litho and there after till this day. Still got all my City & Guilds certificates too, and in their original frames.

Ron
 
Hi Rich, yep Letterpress apprenticed and served, then onto Litho and there after till this day. Still got all my City & Guilds certificates too, and in their original frames.

Ron
Still in general printing? Departed the trade after the fourth offer of redundancy, a lot of the guys I worked with in sheet feed, had to find work in web to remain in the trade.
 
Place I am at does Large sheet fed, Web and Multi-clour Continuous. Quite a mixed bag by todays standards. I regret not staying with Heidelbergs at Brentford. But even they do not carry the prestige they once did.
Print has really suffered during the recessions of recent times. Only got another 4 years to go, if this company survives!

Ron
 
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