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-MadMage
There is generally no interaction between Chromatic Lantern and Mana Echoes. For example, despite Chromatic Lantern, you still add colorless mana (and not, say, mana of a chosen color) with Mana Echoes because a creature entered the battlefield (C.R. 107.4c).
Respectfully, I wanna ask, what makes you think there would be an interaction? I'm just curious as to where your misunderstanding is, to better help you. Chromatic Lantern only affects lands, by giving them a new activated ability that you can activate to produce mana of any color. Mana Echoes is not a land, so there is no interaction. It makes mana, but mana is not land, and land is not mana, lands produce mana, an intangible resource that goes to your mana pool and that you can spend, and that goes away at the end of the current step if you don't. You may think Mana Echoes is "kind of like a land" because it makes mana, but interactions in Magic don't work with "kind ofs".
There's a card with a similar name, Chromatic Orrery, that would actually allow you to use Mana Echoes' colorless mana to pay for colored costs, but the way that card works is completely different. Maybe you mixed up the two?
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Using card tags is mandatory in the Magic Rulings forum. Please check your private messages to learn how to use them. I've added them for this post.
-MadMage
There's a card with a similar name, Chromatic Orrery, that would actually allow you to use Mana Echoes' colorless mana to pay for colored costs, but the way that card works is completely different. Maybe you mixed up the two?