Ya, good luck unless the blower told you. Black could be from 5 differnt glass manufacturers. Most of the glass made by Elev8 will have the colors listed on the product page on the website. If it is a forign made piece it will be
US Color Companies
Northstar (our favorite and oldest)
Glass Alchemy
Boro Stix
Troutman
Parrimore
Molten Auroa
Hand of Man
Foreign colors
Black is black
Amber
Milky Pink (China pink and can also look like pink slime when used properly)
Milky Green (kinda like slime)
Toxic or Lime green (bright see-through green)
Cobalt (dark blue)
Light blue
Charcoal (see-through black)
Violet (see-through light purple
Pink (see-through light pink)