William Overington

Just in case (initiated by your other recent pantone metallic topic). This photo might give an impression of various glossyness of various processes. In my impression printed ink (pantone metallic) looks metallic only in comparison with non-metallic prints of similar color values. So in the sample below the printed silver looks more like gray than metallic – whereas both foils appear obviously reflective (= varying with the light angle / direction).
A glossy varnish might be an option, too. If printed on an according color hue it can make it look quite glossy, but rather like metal / or plastic, which reflects light in a similar way and can also mirror, depending on the light angle.
EDIT: typo below: "varnish" / not vanish

Spot colors usually get a individual name, for Pantone it shouldn't get changed, for custom spot colors it should be specific and either reflect its values or its ink/color impression in a possibly unambiguous way. There is nothing more you can or need to do in Affinity. Of cause for export you need to choose a format which supports spot colors.
If that gets prepared by the software (RIP) of/for a certain print machine without spot colors then it must get replaced by available ink. So it can happen that a custom spot color with custom name "gold" for instance in a company logo will transferred to a specific replacement which can be set in the pre-press options for any color which is named "gold", so that even various files with different custom "gold" spot colors become all printed with the same ink values.

I think you would want 2 different PDF formats, one for archival and one for print. 
The Iridesse will print the metallics but not specific pantone metallics. You basically have silver and gold. Looked at that press a few years ago, did not fit our needs and the metallic is a niche market that we would not make our returns with on that unit. If the print intent is to use metallic from a digital press like the Iridesse or from the other competitors like Ricoh, Konica, Kodak, etc, your best bet would be to connect with a printer who can do this and find out what spot names are needed for the colours themselves. You would not need any specific PDF format for this if it is CMYK + Spots. In Indesign I would generally use High Quality PDF's or X4. Colours are maintained, including spots/pantones. 
 

Really not sure what you are asking. PNG will not retain pantones, nor will bmp or jpg. PDF is a great option and a standard and will retain your colours if the file is setup properly from wherever you make it. Not sure why you want to avoid PDF. Also not sure why you want to use a pantone colour if it is not for print, no screen is going to view the pantone alike so if it is for digital use they are all going to display it differently. Again if PDF's made properly from a vector program or publishing program are great, and can be edited if need be later, though easiest is always the original program that created it. 
What is your intended use for the image you want to save with a pantone? Is it for print? For web?

Pantone or specific brand spot colors informations are informations contained in extra channels, for files in CMYK usually (PSD, TIFF AI...).
Since PDF manage all the needed info, profiles, etc.we usually use this type of file, after importing images using spot colors or using spot colors directly in the document.
For example, you can add a specific area or layer (= channel with specific name), depending of the printer recommendations, so they'll know the areas to add varnish or special inks.
 
If you want to print with Pantones, you can use Pantone swatch depending of the type of paper (coated, uncoated, etc.). There's also today specific Pantone colors, defined to be used on paper and on screen with better results visually, that the old ones taht were different on screen and printed.
But if you want to use metallic or fluorescent colors, there's really, as said by Walter, no reason to use them in files for a screen display. It's better to use effect to simulate visually the result like (gradients for metallic colors), and produce a PDF for print with all the needed informations (color profile, bleed, etc.). Those are distinctive intents that need different files, and it's better since there's no need to put online PDF for print, those are larger and contains items that don't help readers and can be confusing if they're not used to such files.

The latest digital presses from Xerox can do gold/silver print so you might be able to find a short run supplier to meet your needs. 

That looks distinctly green on my screen! (The background to your default ‘W’ avatar looks closer to a gold colour than that JPEG.)
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You can change your avatar here.
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Yes.

As I understand it, the purpose of Pantone colors is to be printed, not viewed online. I'm not sure why one would use them for something to be viewed on a monitor, where the colors cannot possibly match their intended print usage. But I suppose Print (Press Ready) is the right Affinity document type, and you just take your chances on how a CMYK PDF file displays in applications that generally expect RGB (and may or may not be color-managed, anyway).

Oh, don't assume age here! Some of us remember the first Sputnik going up ... and round and round.
Though I had not known of Ed Roth, but I am in England so maybe that explains it.
Thank you for explaining the process by which you got to your final result and for including the intermediate stages.
William

Interestingly, the comet in the sky.
Although it has a tail, which might give an impression of being motion lines, as in cartoon graphics, comets do not appear to move over a short period of time. They move over a longer time, but not like a thin fast line from a meteorite entering the earth's atmosphere and burning up.
I saw the Hale-Bopp comet one night back in 1997 and it was bright in the night sky but appeared, during the several minutes that I observed it, to be static in the night sky.
https://en.wikipedia.org/wiki/Comet_Hale%E2%80%93Bopp
William
 
 

Yes. Big Daddy Roth was a big inspiration to me as a kid. West Coast Hot Rod pop culture was huge in the 60s. I didn't mention his name in my post because I assumed most people here on this forum would be too young to know who he is. 

Here's my first image post.
I started this one in Designer with a pencil sketch in the Pixel persona. Then I created the "ink" lines with the pen tool in the Designer persona. I tweaked the ink line stroke profiles in the stroke studio and finished the art in Photo.

From some of the images online they look more satin than gloss, so closer to the sheen of gold leaf.

Panel Preferences (hamburger) menu: Show as List.

yes you can definitely use Pantones in Designer.
First thing you want to open the Swatch panel, then in there click the pull down menu and select the colour book you want to use. If you are using this for print on paper you would want Formula Guide Solid Coated or Uncoated. Now just select the colour you want to use. 

You can use the Search bar at the bottom of the Swatches panel. For example, type PANTONE 363 there.
However, it only searches within the current swatch palette that you have selected. So if you don't know which Pantone palette has that color, you'll need to go through them one at a time. Start with the first one, type PANTONE 363 into the Search box, and if you don't get a result, go to the next palette, then the next, etc. The Search box will remain populated, so you don't need to retype the search string.

Shh! You weren’t supposed to tell everyone!!
 

Ah, I wondered why the square brackets, but then I spotted my miskeying and lack of proofreading!
I have now corrected my earlier post.
William
 
 

Hello! I am also waiting for news from SERIF about accessibility in Affinity Publisher. Thanks! 

@William Overington
You can click on the image, and it'll be larger on a dark background, a better view than small size on a thread.
You can also wait until a magnifier appears when the cursor is on this larger picture, and if you click then, the image will open in a new tab. You'll be able to display it full screen.

Thank you all for your positives reviews.
William Overington, yes I created that glass dome to look very subtle by using 2 layers, one for the glass effect and other to give a light effect from the right. 
And I'll follow your advice on the spacing between the text and image.
 

I like the transparent hemisphere. I did not notice at first.
May I suggest please that you edit your post and put five or even seven blank lines of text both before and after the image, so that it is displayed isolated from other items and notes?
William
 

I am new one and probably my work is not perfect. I just try what all i can do or not with affinity.