the slightly yellow/green tint - which I think can be seen (just) in the second pic - might possibly be the result of manganese being used as a decolouriser. Sometimes a lack of lead oxide can also give a yellowish look - glass with a high lead content tends to appear blueish.
Using a uv torch on clear glass containing manganese will accentuate the colour of the manganese and give a dull greyish green colour, more noticable in the thicker parts of the the glass - but won't produce the bright fluorecent green of uranium. UV torches are quite cheap Nicky (on line) and are a very good investment and help if you do occasionally collect uranium glass.