Explanation:

In Pakala Narayan Swami v Emperor Lord Atkin observed
“ A confession must either admit in terms the offence or at any rate substantially all the facts which constitute the offence. An admission of a gravely incriminating fact, even a conclusively incriminating fact is not in itself a confession”.

In the case of Palvinder Kaur v State of Punjab the Supreme Court approved the Privy Council decision in Pakala Narayan Swami case over two scores.
Firstly, that the definition if confession is that it must either admit the guilt in terms or admit substantially all the facts which constitute the offence. Secondly, that a mixed up statement which even though contains some confessional statement will still lead to acquittal, is no confession. Thus, a statement that contains self-exculpatory matter which if true would negate the matter or offence, cannot amount to confession