in Copper Green and EDP
- Lynn Short
Lynn’s research findings of 2015:
Work in a neutral flame – go for more oxygen if you’re not
sure. EDP doesn’t like propane.
careful not to let the glass boil.
Very thin CG stringer is pretty, but very thin EDP stringer may
fade to a dull peach color.
CG/EDP color reactions develop with time in the flame.
Don’t worry too much about the color (besides dark gray – you
don’t want that!) or devitrification that may develop while
you’re making and decorating the bead.
any pitting develops, work the resulting bubbles out of the bead
before finishing it.
Once you’re satisfied with the bead shape and decoration, cool
the bead a bit and put it back into the flame until it all glows
Achieving the red glow with lentils is a bit more challenging
than with rounded shapes, as you’ll need to work each side
Check the returning color before putting the bead in the kiln.
If it’s got any remaining problem areas, heat to glowing again.
Encasing EDP in clear changes the color to a lovely pink!
changes were found with devitrified beads soaked for an hour in
jeweler’s pickle, Pepsi, Lime-A-Way, or Lysol Power & Free
Toilet Bowl Cleaner with Hydrogen Peroxide.
Etching is always an option.
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What NOT to
Be careful not to let the glass boil. Keep the bead a bit farther
out in the flame, or turn the flame down a bit. Bubbling
creates scum and pitting.
A slightly reducing flame may clear EDP devitrification, but
propane is what turns the glass gray.
If the copper green sparks and boils enough, it may become
Do not add insurance heat! That little flashing in the flame
causes devitrification, so unless you’re looking for a whitish,
etched look, don’t be tempted.
There has been some speculation in the lampworking forums that a
closed kiln (used for batch annealing) or one that’s been used
with metals may cause devitrification.
“I have made several sets of this color combination and I agree it sure is pretty. The
secret with EDP is that after you decorate your
bead, heat it all up until the purple is shiny again. Heat
the snot out of it then take it out of the flame and DON'T put it
back in again. This will cause the EDP to get all devitrified
What I really like about EDP and CG together is the many colors
you can get out of it. When the EDP spreads, it
causes the CG to get darker or lighter, depending on the design
and placement of colors. The
round CG beads
in the photo were dipped in etch all to remove the gunk. Just
dipped in and out to get rid of the grey, but not etched
Copper Green suggestions from the same website:
pictures, but one of my favorite combos is copper green, ivory,
and dark violet. And if you hold your mouth just right, you can
get the metallic hints on the green and violet.”
“I make a core bead of white or ivory and cover it
with copper green. I do this with all the expensive colors. I
really like it over black too. And mixed with rubino pink is
awesome. The first bead is black base, 4/5th's copper green frit
with 1/5th of periwinkle frit mixed in, encased. The clear
encasing bled but I like how it looks. P.S. I made my frit in a
Another bead is a black base, silver, copper green
dots topped with rubino
pink. It is so real
looking you want to touch it to see if it's
snakeskin! Good luck.