carolross

Change this search to your location & currency. Cheapest 2nd hand here is £232!
https://tinyurl.com/2p4k2jst
Does your country have an inter-loan library system?
I've no idea if the sign-up ebook services or are real or scam., but a google for ash glazes phil rogers pdf turns up
http://infinity.wecabrio.com/080198243X-ash-glazes.pdf
... and a thesis by somebody else on glazy
https://wiki.glazy.org/uploads/default/original/1X/085b890dabdd507a348fdcc09e4247b954029145.pdf
Posts for wood ash on glazy at https://glazy.org/?keywords=wood ash
... including a Stull Chart
 

I’d try to contact the artist and ask.  As you can tell from these forums, clay people are very generous and, from my own experience, are almost always happy to share and help out.  Good luck!
The first photo does look like gold luster, but I don’t think it’s ever red when applied.  Although you might achieve the same results with luster.
oops - my mistake!  I wasn’t aware that gold lustre could have a red brushing medium.  My apologies!

recently fired a very flat piece leaning against a kiln post.  one of the square kind, i usually fire with the small triangular posts to save room on each shelf.  thank you marcia selsor for showing how you lean your bisque pieces.