There seem to be a lot of very important glass manufacturers left out of the poll. I use Ornela. Wish people would stop using the word Czech as there are quite a number of manufacturers in the Czech Republic.
Their uranium yellows are uncomparable. " Anna yellow"
Kugler who also have an anna yellow but it is a totally different colour.
Plowden and Thompson or as it is known. " Dial glass" but many of their colours devitrify readily. Esp the selenium pinks. Their uranium yellow tube is a cased colour of very watery hue. ie pale.
Kugler glass colours but I personally prefer Reichenbach as it is half the price. But in the US all colour glass is out of this world in price. Too high a mark ups. "Greed"
This could be why Gaffer Glass are opening their own warehouse in the UK!
to supply the European market.
And of course Zimmerman that make uncomparable dark opaque greens and bright turquoise's.
Ornela reds yellows and quite a number of other colours are unmatched by anyone but their COE's need looking at for a consistent matching product.
A few Gaffer glass colours but find they are not really all that flame friendly so would not recomend them except as frits to the less experienced lamp worker..
And of course for those uncomparable silver reduction colours. " FLAME DAISYS
" Black Death " is a colour that would drive the average bead maker into extasy with its colour variations attainable under reduction. From the jet black transparent base glass through peacock blues with amazing brillance to greens yellows and straw browns and tan. They do not sell it to people other than when you personally visit them and become a known customer.. So dont
Unless of course you make a trip to their studio in New Zealand then you would recieve a very warm welcome.
If you make a screw up just re oxidise the glass in an oxygen rich flame and presto its back to black for another reduction. Amazing. Truely amazing. I sent a mix of rods, powders and coarse frits to a collegue in Australia recently and they are amazed. Its incredible and to another person but they have not responded yet.
So the list presented is far from representative of what is available world wide.
Regarding the image below.
Sorry about the fuzzy image but I dont own a Digi camera and rely on borrowing one occasionally once a year. Im all fingers and thumbs here.
The red is Ornela. The brighter blue Kugler. White Gaffer and clear my own glass melted at Flame Daisy and hand drawn into sixty foot lengths from three or four kilo gathers. That was an intersting weeks work in Nelson New Zealand...Greens are Reichenbach, Ornela and Zimmerman
A little about the crystal clear. Its The Gaffer master glass recipie but no Sulphate, Carbon or Antimony. Replaced it by Cerium.
Pulling rod across fifty wooden slats like a ladder and cutting it before the next pull a few minutes later. Kept two of us running all day. It took three days to clean the pot out.. Also make a few blown objects and paperweights at the same time.
Virtually got a lifetimes supply of glass and its good. You get no join lines or flame discolouration because of the Cerium used as a fining agent. The reduction of the fining agents "Miss called sooting by the ignorant".
As its of a much lower melting point than the colour. Encasing is babies play. No bubbles. It melts almost like water.
If bubbles are accidently trapped the Flame daisy method easily gets rid of them without distortion of the base glass detail which no other method seems to do..
Occasionally the method is taught at the HOGLUND INTERNATIONAL GLASS CENTRE
lamp working classes. If you happen to strike the right tutor.