Some of my recent finds from Seaham (NE England), the black glass all show different colours when a light is shone through, it's sometimes known as secret glass or pirate glass! :
The Truth about Pirate Glass – Beachcombing Magazine
Pirate Glass - Black Sea Glass -- 364ct -- RAREST OLDEST 1500s - 1700s #BPG23 | eBay
Pirate Glass. Found today at Point Lonsdale, Victoria, Australia. Anyone want to identify it? : r/seaglass
Large Black Sea Glass Curio Pirate Glass Vintage Black Beach Glass Shard Possibly From a Glass Tile - Etsy UK
Orlando Pirates Beer Glass | Flat Bottom Glasses | Glassware | Kitchen | Household | Shoprite ZA
THE TRUE COLORS OF BLACK SEA GLASS – Echoes of LBI
Black Pirate Sea Glass Color | Rock & Gem Magazine
SPECIAL - Seaham Sea Glass - Display Pieces LOT 2 – TiliabytheSea
Black Sea Glass
Black Sea Glass
Identifying Black Sea Glass - YouTube
Pirate Glass - Black Sea Glass -- 479ct -- RAREST OLDEST 1500s - 1700s #BPG24 | eBay
Black Sea Glass Shard
THE TRUE COLORS OF BLACK SEA GLASS – Echoes of LBI
Black Sea Glass Pirate Glass Vintage Beach Glass Pieces From Antique Bottles in a Shade of Green so Dark They Appear Black - Etsy Australia
Beachcomber's View: Science of Sea Glass | Coastal Review
The Truth about Pirate Glass – Beachcombing Magazine
Black Sea Glass
The beauty of pirate glass, it looks like any other rock on the beach until light shines through it 💚🌊 www.etsy.com/uk/shop/libandleojewellery | By Lib and Leo JewelleryFacebook
A Beachcombers View - Pirate Glass | Island Free Press
Black Sea Glass Shard
What is Pirate Glass? - Discover The Outdoors
Unique Bottle Steampunk Bottle Hand Decorated Bottle Pirates | Etsy | Pirate decor, Custom bottles, Glass bottles art
