Ruth DeLorraine of Campbell, NY asked for a comparison of Flemish & Celeste
Blue. Better yet, Jim Barlow of Detroit has a picture of three blues which are
attached. Celeste Blue is the lighter of the blues. Flemish is a cobalt blue. The attached
picture comparison chart. left to right: Flemish, French, Celeste

Randy Bly responds to Marshall Ketchum’s comment that Persian Blue isn’t quite
rare.

Marshall is right on the rarity of the color Persian Blue. This has been my
observation. I have seen it about as often as Sea Green. It is not in the same
category as would be Cardinal Red, Royal Purple, or Cinnamon Gold Ruby.
Nonetheless, I have found it to be far from common.

David Donaldson of Orlando comments:
Flemish and French are made with cobalt oxide, and Celeste is mad with copper
nitrate or some such copper salt.
Then we have a question on identifying the colors on color picture and
identification sent out in the last e-mail.
the picture Jim sent you appears to be not of Flemish, but of cobalt blue on the left.
Am I mistaken? We’ll try and get an answer.

From Beth Shaut at the Carder Steuben Shop in Corning.
Hi Alan, As from conversation with Mr. Rockwell and Chris Revi; Carder said that his cobalt was used as the base glass for his Aurene glass. Also that his darkest shade of Blue in Crystal was Flemish which is a shade lighter than Cobalt glass. The reason given for the Bristol reeding being missing was that the composition differences of the two types. We have here at the shop the Bristol Yellow with Flint White Reeding that also has loss of Reeding because of composition. We have a Flared Fluted Vase in the Persian
Blue and Bristol Yellow here at the shop. Persian Blue is a darker color than the Celeste Blue. You see this when you set two piece next to each other.

Then Don Love of Spooner, WI asks:
Hello Alan, I have a set of stemware that have a clear bowl & blue stem & foot. My question is: Is Persian Blue the only blue that glows bright green under black light ? My set all glow bright green under the black light & I thought that they were Celeste Blue. Thanks, Don

The person questioning the color identification from the picture comparing three different blues apologizes and says that was mistaken.

Then this commentary goes with the attached picture.
All three show the same color characteristics when viewed in person. Viewing anything from a
photograph or from a monitor is highly subjective.
“page 177 Dimitroff calls fig 7.79 Flemish. Fig 10.107 shows the bonbon in celeste.”