def METHOD_NAME(self, color_method=None):
    """Highlights the difference between two texts using color.
    Has to account for deletions and insertions from original text to
    perturbed. Relies on the index map stored in
    ``self.original_result.attacked_text.attack_attrs["original_index_map"]``.
    """
    t1 = self.original_result.attacked_text
    t2 = self.perturbed_result.attacked_text
    if detect(t1.text) == "zh-cn" or detect(t1.text) == "ko":
        return t1.printable_text(), t2.printable_text()
    if color_method is None:
        return t1.printable_text(), t2.printable_text()
    color_1 = self.original_result.get_text_color_input()
    color_2 = self.perturbed_result.get_text_color_perturbed()
    # iterate through and count equal/unequal words
    words_1_idxs = []
    t2_equal_idxs = set()
    original_index_map = t2.attack_attrs["original_index_map"]
    for t1_idx, t2_idx in enumerate(original_index_map):
        if t2_idx == -1:
            # add words in t1 that are not in t2
            words_1_idxs.append(t1_idx)
        else:
            w1 = t1.words[t1_idx]
            w2 = t2.words[t2_idx]
            if w1 == w2:
                t2_equal_idxs.add(t2_idx)
            else:
                words_1_idxs.append(t1_idx)
    # words to color in t2 are all the words that didn't have an equal,
    # mapped word in t1
    words_2_idxs = list(sorted(set(range(t2.num_words)) - t2_equal_idxs))
    # make lists of colored words
    words_1 = [t1.words[i] for i in words_1_idxs]
    words_1 = [utils.color_text(w, color_1, color_method) for w in words_1]
    words_2 = [t2.words[i] for i in words_2_idxs]
    words_2 = [utils.color_text(w, color_2, color_method) for w in words_2]
    t1 = self.original_result.attacked_text.replace_words_at_indices(
        words_1_idxs, words_1
    )
    t2 = self.perturbed_result.attacked_text.replace_words_at_indices(
        words_2_idxs, words_2
    )
    key_color = ("bold", "underline")
    return (
        t1.printable_text(key_color=key_color, key_color_method=color_method),
        t2.printable_text(key_color=key_color, key_color_method=color_method),
    )