OS. aspirates became voiceless spirants; [{ptk}ʰ|{ptk}{ptk}ʰ] > [{ɸθx}|{ɸθx}{ɸθx}]

OS. voiceless stops aspirated after consonants except [s]; [{ptkmnŋlr}{ptk}] > [{ptkmnŋlr}{ptk}ʰ]

In both Old Sindarin and Old Noldorin, voiceless stops [p, t, k] developed into spirants medially after nearly every other primitive consonant, in particular: all liquids [r, l], all nasals [m, n, ŋ], all aspirates [pʰ, tʰ, kʰ] and all other voiced and voiceless stops [b, d, g, p, t, k], that is essentially everything but [s]. In the last two cases, the both stops in the pair both became spirants, with various later vocalic effects (see below).

OS. [oi], [ǭi] became [ui], [oi]; [oi|ǭi] > [ui|oi]

What could the noun "print" = " a result of pressing" be in Quenya? We do have the verb sanga-, from STAG, and the nouns sanga and sanguma attested.

OS. [ei], [ou] became [ī], [ū]; [ei|ou] > [ī|ū]

OS. [j] became [i] after vowels; [VjV|-Vj] > [ViV|-Vi]

It is well known that non-initial y ([j]) became vocalic [i] in both Sindarin and Noldorin. This is reflected in its spelling system, where i represented a vowel in the middle of words, but y at the beginning of words:

OS. [ā] became [ǭ]; [ā] > [ǭ]

In (Old) Sindarin long [ā] developed into [ǭ], and then later [ǭ] became [au]. This sound change is discussed in the second version of Tengwesta Qenderinwa from around 1950, written during the transitional period between Noldorin to Sindarin:

OS. [eu] became [iu]; [eu] > [iu]