CTS (Color Temperature Straw) is just about right, actually. The other alternative, CTO (Color Temperature Orange) is, in some senses, "more correct", but the heavier red bias makes some people feel like they're working by candlelight - even in brighter light, it feels a bit dim and closer to bedtime.

Depending on where you are you probably don't need to order this! Many areas have theater supply stores, for example in Santa Clara, CA there is a great one: https://www.musson.com/

If you are trying to achieve a more neutral or less noticeable 'natural' light, combining 'No Color Pink' and 'No Color Blue' can be very effective.

http://www.stagelightingstore.com/33-No-Color-Pink

http://www.stagelightingstore.com/60-No-Color-Blue

If you're happy with the color, there are also neutral density filters in a variety of transmission levels: http://www.stagelightingstore.com/Rosco-Supergel-398-Neutral...