תלמוד על בבא מציעא 6:1

MISHNAH: If one gave wool to the dyer and the vat burned it, he gives him the value of his wool^47,By his unprofessional work he changed the material from his prior state and acquired it as his property for which he has to pay.⁴⁸In this case, the material is lost; it is impossible to refer to improved value.. If he dyed it poorly, if the increased value is more than the expenses⁴⁹The dyer’s cash expenses for dye and fuel., he gives him his expenses; if the expenses are more than the increased value he gives him the increased value.
To dye it red and he dyed it black, black and he dyed it red, Rebbi Meïr says, he gives him the value of his wool⁴⁷By his unprofessional work he changed the material from his prior state and acquired it as his property for which he has to pay.. Rebbi Jehudah says, if the increased value is more than the expenses, he gives him his expenses; if the expenses are more than the increased value he gives him the increased value.