Thanks for getting in touch. Our CLM35 (pre mixed with lime putty and sand) would be appropriate for this. It will dry a buff/biscuit colour.
Alternatively you could use our Drymix CLD35 NHL2 – they will both dry the same colour due to the same sand being used.
Please see a link to the example colour here: https://cornishlime.co.uk/products/lime-mortars/fine-putty-mortars/
If you need further information please don’t hesitate to get in touch.