DMC 3808 to Madeira: Thread Conversion

Madeira 1114 is a close match that can run very slightly darker than the DMC in some dye lots. In deep-ocean and dark tile mosaic applications, this slightly deeper reading is rarely a practical problem and may actually enhance the shadow depth. For precise gradient work where 3808's exact value relationship with 3809 matters, comparing both threads under daylight confirms the gradient step reads as intended.