Papers to minimise fade with aftermarket dye inks.

[mikling]

https://www.youtube.com/watch?v=8XtVm8z28e4

 

[pharmacist]

Can you explain how this is true from a chemistry perspective? If I recall my physical chemistry (and it's been a lot of years since I finished both my undergrad and grad degrees in chemistry) it's the aromatic double bonds in the dye molecules are damaged and it doesn't particularly matter what causes the damage.

Colour is actually a perceived absorption of certain wave lengths of visible light. Photons excitate electrons of double bounds of dye molecules. The intrinsic nature of dye molecules is that they all have a larrge resonance surface across the conjugated aromatic rings, by which the amount of energy is evenly distributed over the dance of electrons, moving freely across the conjugated aromatic system. The larger the surface the deeper the colour perceived by your eyes. Some conjugated aromatic systems are pH sensitive: by lowering of increasing pH, the dance of the electrons across the conjugated aromatic system will cease, when photons tries to excitate the outer electrons, rendering the molecule colourless to your eyes. For example: fenolftalein, methyl red. Som other molecules form strong metallo-organic compounds, making very deep and almost fade resistent pigments, like gallic acid with iron salts (iron gall ink).

 

[mikling]

Color is due to conjugated double bonds in a dye molecule. When the bonds are broken, color is reduced.

Dyes that are good for UV light fastness generally have a metal atom like copper complexed into the dye molecule. When a photon ( UV) breaks a bond ( the bond is made by shared electrons between two carbon atoms), the metal atom limits the damage because metal atoms are electron rich and donate electrons to the bond.

Ozone breaks a bond due to oxidation. The electrons in the metal atom in a lightfast dye actually help promote the oxidation and destruction of the double bond.

 

[stratman]

The Hat needs to get himself to confessional after Liking that video.

Two things: Beat them like a rented mule and never let Percy follow you.

 

[peter D]

It's shipping now with TNT


The samples are as follows:


Glossy: A4X25sheets


Satin: A4X25sheets


Pearl: A4X15sheets.


Satin is luster.Pearl is another type of luster.We are selling more satin paper.Please check.

Strangely on the Giant Image website the only papers listed under RC Swellable Inkjet Paper are Gloss and Lustre both 230gsm weight and available in roll and cut sheets.
http://www.bdgiantimage.com/en/products_view.asp?id=45

Their RC Microporous Resin Coated Paper is available in the in Glossy, Satin, Pearl and Silk all 260 gsm paper (and some lighter grades) all billed as water resistant and instant drying photo paper.
http://www.bdgiantimage.com/en/products_view.asp?id=28

Did they advise what the gsm is for the sample papers they have sent? I'm hoping you can confirm for us whether it is indeed a swellable inkjet paper they have sent to you and that you will let us know your impressions of it.

I've also asked this company for a quotation on A4 sample packs of their RC Swellable to be sent to New Zealand.
I have some experience printing on HP Premium Plus 280 gsm High Gloss that Mikling has recommended as a swellable paper in the past. This particular paper is more of a grey white than the Canon papers that I normally use.
For the Canon papers I usually spray with a Helmar fixative spray and which helps protect them from exposure to the atmosphere and fingermarks. When dry the sprayed surface can be lightly buffed with a soft cloth to a finish that lies between high gloss and lustre and no stippling of the surface is apparent.

 

[Ink stained Fingers]

the shipment to me is underway, so let's see and wait until it arrives. All my communication with bdgiantimage was about swellable papers.

 

[The Hat]

The Hat needs to get himself to confessional after Liking that video.

Who wouldn’t... It was hilarious, and Percy nearly got the winner...

 

[berttheghost]

Color is due to conjugated double bonds in a dye molecule. When the bonds are broken, color is reduced.

Ozone breaks a bond due to oxidation. The electrons in the metal atom in a lightfast dye actually help promote the oxidation and destruction of the double bond.

I was under the impression that the primary reaction involved in UV induced fading is also an oxidation reaction, utilizing O2 instead of O3. Which would imply that the swellable coating might protect either type of dye against both O2 and O3 related fading.

Thanks also to yourself, @Ink stained Fingers and all the others who take time and effort to investigate and share their results with us.

 

[peter D]

the shipment to me is underway, so let's see and wait until it arrives. All my communication with bdgiantimage was about swellable papers.

A bit more information has just been provided by Mr Wei Yu of Giant Image about the swellable papers. Apparently last month they determined that the gsm is 220 not 230 as on the website and they have not yet corrected the website. I'm happy with paper 260gsm -300gsm but have reservations about a 220gsm paper as I've found it is easy to put permanent dents in the lighter papers (even 260gsm) unless it is handled very carefully. The HP Premium Plus is 280gsm and my Ilford cheaper inkjet photo papers are 250gsm.

On the plus side Mr Wei Yu is flexible when it comes to freight options which is important for me as DHL is an expensive option for New Zealand.
I await Ink Stained Fingers report on the sample papers with interest.

 

[pharmacist]

A potential reducing agent, but toxic is expsong your prints to fumes of formaldehyde. This is a reducing agent, which can restore the double bounds of the dye molecules enabling the resonance dance of electrons over the conjugated cyclic skeleton of the dye molecule. I always found Canon Photo Paper Pro having a particular formaldehyde like smell to it. It could be also applied to compete with the oxidising agents like oxygene, ozone, NO etc, being much more easier to be oxidised than the dye molecules.