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b. 10

composition: Op. 28 No. 14, Prelude in E♭ minor

..

In A (→FE) a cautionary  is only before c1. In the main text we add a corresponding accidental also in the L.H. That addition was already introduced by FC (→GE) and EE. See also b. 13.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions , Cautionary accidentals , Fontana's revisions

b. 13

composition: Op. 28 No. 14, Prelude in E♭ minor

..

In A and the remaining sources there is a cautionary  before c1. In FC (→GE) and EE before c in the L.H. part was also added. In the main text we omit those unjustified accidentals.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions , Cautionary accidentals , Last key signature sign , Fontana's revisions

b. 14

composition: Op. 28 No. 14, Prelude in E♭ minor

..

No sources except FC include accidentals before the 8th quaver in the bar; FC features  's restoring e-e1, written most probably in pencil. As was the case with a number of other similar additions, those accidentals were added by H. Scholtz, who introduced them also into the 1879 Peters edition he edited. An analogous change can also be found in many other subsequent editions of the Preludes. A possible oversight of the flats restoring e-e1 would not be unusual here, since similar mistakes are among the most frequently committed by Chopin; however, the very possibility of a mistake does not mean that the mistake was actually committed, particularly since there are no musical reasons to consider the version written in the sources to be erroneous. 

category imprint: Interpretations within context

issues: Omissions to cancel alteration , Foreign hand additions in manuscripts

b. 14

composition: Op. 28 No. 14, Prelude in E♭ minor

..

In A (→FE) there is no  restoring B at the beginning of the 2nd half of the bar (however, a corresponding accidental is featured in the R.H. part). The flat was added in FC (→GE) and EE.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , Fontana's revisions , Inaccuracies in A

b. 15

composition: Op. 28 No. 14, Prelude in E♭ minor

..

In the main text we add cautionary flats before G-g.

category imprint: Editorial revisions