For me this technique is interesting for the bicoloured glass you find at Seaham and in a couple of other places in the world - but for regular green/blue/brown etc seaglass it's stripping away the thing that has made it 'sea'glass and returning it to being...well...glass. As the bicolour is the only thing that can be used to identify the glass as genuine Seaham seaglass I would focus on these rather than the single colours. My 2 pence worth...