A shard of hard red translucent plastic about 7mm in length and 3mm wide with sand grains attached - from Musselburgh

Images collected at today at Ocean Terminal shopping centre using Leith Labs microscope and my phone camera

A hard fragment of blue plastic in amongst sand grains - from Musselburgh

Fragments of hard plastics 1/2-3mm in size, resulting from degradation of much larger items
from a manta trawl on a previous expedition