taxation provision in case of delisted scrips

one of my relative holds 10-12 scrips which were purchased between 1992-2003 which hav now been delisted from trading. all the scrips were shown as an investments in his books of accounts. what will be the tax incidence if he writes off the whole investment? is he eligible to treat it as long term capital loss under the income tax act which can be set off against long term capital gain?