Sea Glass that Changes Colour

by Ron Evans

Dark blue in normal light

Dark blue in normal light

~sea glass question submitted by Ron Evans, Staffordshire,England, UK

SeaGlass found at Marloes Sands in Pembrokeshire, Wales


Anyone know why the sea glass I found on Marloes Sands is dark blue innormal light and a golden/yellow when back lit or held up to the light?

~ seaglass question submitted by Ron Evans, Staffordshire,England, UK

About MarloesSands, Wales:

Marloes Sands is anapprox. 1.5 kilometres (0.93 mi) long remote sandy beach inPembrokeshire, Wales, near the village of Marloes.

It's broadly curved and surrounded by cliffs. Walking on the beachgives great views of Skokholm Island and Gateholm Island.


The beach is located SWfrom the Marloes village and there is a National Trust car-park nearby(charge per day or free for National Trust members).
There is a track that leads from the main road to the beach.

There is a disused World War II Royal Air Force airfield RAF Dale,above the south east cliffs of the beach.

There are approximately three accesses to the beach which become veryuseful if you get caught by the tide coming in.

Besides the main access from Runwayskiln there is also an access to thenorth, near Gateholm Island, that requires some scrambling over therocks and another access to the south that has steps leading to themidsection of the beach.

~from Wikipedia

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Comments for Sea Glass that Changes Colour

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Jan 04, 2019
Neodymium Glass
by: Sue

This purple glass changes color in the different lights, from a different shade of purple to sometime a golden color.. NEODYMIUM SEA GLASS.

Aug 14, 2017
Blackpill, Swansea
by: Philip Hill, Swansea

Blackpill, Swansea

Aug 14,2017

Blackpill is situated a few miles from the Mumbles in Swansea.

The beach is pretty sandy with loàds of sea shells, so making glass hunting a bit tricky.

After wandering up and down a short stretch for about half and hour, came back with about twenty bits of glass, varying in size, usual mixture of green and clear.

May 17, 2014
Purpled Lead?
by: Tim in New England

Just a guess, but maybe it's purpled yellow lead glass, or glass that's been artificially purpled?

See the following link:


Good article Tim! Although the article talks about artificially purpling with an ultraviolet light, it is quite possible that the glass with lead in it has become naturally purpled over time to exposure in the environment of the beach.

The article referred to speaks of those who speed up the natural process by exposing old leaded glass to artificial ultraviolet lights.

I believe all long-time collectors have found lightly-purpled glass (once was clear but purpled due to sun exposure). However, this explanation of yellow glass turning purple is excellent and thank you for the reference!

David and Lin @

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