Here is the fading Supernova in NGC 7331. Wind caused some tracking errors.
The first image is RGB and the second is CMY where the following approximations was used for CMY :

(Red + blue)/2 transforms to Mangenta
Yellow is Yellow
(Blue + green)/2 transforms to Cyan

https://en.wikipedia.org/wiki/NGC_7331

Time: 20:26UT 2025-09-17 Exp.10, 10, 30 x 125sec (RGB)
Telescope: 0.254m f/6 ST-10XME CCD -25°C 0.9"/pix

Time: 20:26UT 2025-09-17 Exp.20, 20, 15 x 125sec (CMY)
Telescope: 0.254m f/6 ST-10XME CCD -25°C 0.9"/pix
Odd Trondal Obs.code 238 (Uranium). Oslo Norway.

2025rbs (= GOTO25evh), AstroNote 2025-213, discovered 2025/07/14.141 by GOTO Found in NGC 7331 at R.A. = 22h37m03s.645, Decl. = +34°25'07".96 Mag 17.1:7/14, Type Ia (zhost=0.002722) (References: TNS; SN 2014C, 2013bu)