Before the word udaka when the compound denotes a mixture, the last syllable of the first member has the acute accent (udātta).,
Thus गुडो꣡दकम् or गुडो॑दकम्, तिलो꣡दकम् or तिलो॑दकम् ॥ When we have already made the उ and ल acute by this rule, then the svarita accent may result optionally, by the combination of the acute अ of guda and tila and the subsequent grave उ of उदक, by Rule 8.2.6. The word अकेवल in means mixture. When mixture is not meant, this rule does not apply. As शीतोदकम्, उष्णोदकम् ॥,